Fix summary API endpoint returning truncated JSON

[hingev]

Upon startup, until hashrate statistics for all intervals were available, the http response for the summary endpoint would be corrupted.

"hashrate": {
  "total": [12930.96, null, null],
  "highest": 12968.11,
  "threads": [
      [671.19, %  

This was previously mentioned in #290 and #3363
With this fix, it should instead return

"hashrate": {
    "total": [743.79, null, null],
    "highest": 744.94,
    "threads": [
        [743.79, null, null],
        [723.8, null, null],
        [669.71, null, null],
        [720.22, null, null],
        [652.88, null, null],
        [740.84, null, null],
        [741.47, null, null],
        [725.48, null, null],
        [722.22, null, null],
        [741.58, null, null],
        [721.69, null, null],
        [740.42, null, null],
        [723.69, null, null],
        [740.0, null, null],
        [652.56, null, null],
        [670.66, null, null],
        [720.43, null, null],
        [744.73, null, null]
    ]
}

[xmrig]

I unable to reproduce this, also hashrate values handled by Json::normalize https://github.com/xmrig/xmrig/blob/master/src/base/io/json/Json.cpp#L210 so the extra call of std::isnormal should change nothing. If there is a bug it is located somewhere else.
Thank you.

[RobQuistNL]

This is happening for me too (6.21.2), on 2 different machines. See output here:

{
    "id": "2a71d747672e9862",
    "worker_id": "aorus",
    "uptime": 10,
    "restricted": true,
    "resources": {
        "memory": {
            "free": 111335350272,
            "total": 134157017088,
            "resident_set_memory": 9293824
        },
        "load_average": [5.16, 1.18, 0.46],
        "hardware_concurrency": 32
    },
    "features": ["api", "asm", "http", "hwloc", "tls"],
    "results": {
        "diff_current": 50000,
        "shares_good": 1,
        "shares_total": 1,
        "avg_time": 10,
        "avg_time_ms": 10622,
        "hashes_total": 50000,
        "best": [1046478, 0, 0, 0, 0, 0, 0, 0, 0, 0],
        "error_log": []
    },
    "algo": "rx/0",
    "connection": {
        "pool": "pool.supportxmr.com:3333",
        "ip": "141.94.96.71",
        "uptime": 10,
        "uptime_ms": 10622,
        "ping": 40,
        "failures": 0,
        "tls": null,
        "tls-fingerprint": null,
        "algo": "rx/0",
        "diff": 50000,
        "accepted": 1,
        "rejected": 0,
        "avg_time": 10,
        "avg_time_ms": 10622,
        "hashes_total": 50000,
        "error_log": []
    },
    "version": "6.21.2",
    "kind": "miner",
    "ua": "XMRig/6.21.2 (Linux x86_64) libuv/1.48.0 gcc/13.2.1",
    "cpu": {
        "brand": "AMD Ryzen 9 7950X 16-Core Processor",
        "family": 25,
        "model": 97,
        "stepping": 2,
        "proc_info": 10882834,
        "aes": true,
        "avx2": true,
        "x64": true,
        "64_bit": true,
        "l2": 16777216,
        "l3": 67108864,
        "cores": 16,
        "threads": 32,
        "packages": 1,
        "nodes": 1,
        "backend": "hwloc/2.10.0",
        "msr": "ryzen_19h_zen4",
        "assembly": "ryzen",
        "arch": "x86_64",
        "flags": ["aes", "vaes", "avx", "avx2", "avx512f", "bmi2", "osxsave", "pdpe1gb", "sse2", "ssse3", "sse4.1", "popcnt", "cat_l3"]
    },
    "donate_level": 1,
    "paused": false,
    "algorithms": ["cn/1", "cn/2", "cn/r", "cn/fast", "cn/half", "cn/xao", "cn/rto", "cn/rwz", "cn/zls", "cn/double", "cn/ccx", "cn-lite/1", "cn-heavy/0", "cn-heavy/tube", "cn-heavy/xhv", "cn-pico", "cn-pico/tlo", "cn/upx2", "rx/0", "rx/wow", "rx/arq", "rx/graft", "rx/sfx", "rx/keva", "argon2/chukwa", "argon2/chukwav2", "argon2/ninja", "ghostrider"],
    "hashrate": {
        "total": [null, null, null],
        "highest": null,
        "threads": [
            [

{
    "id": "592e1a54621dcbf3",
    "worker_id": "ubuntu-desktop",
    "uptime": 179,
    "restricted": true,
    "resources": {
        "memory": {
            "free": 92244426752,
            "total": 134977318912,
            "resident_set_memory": 8257536
        },
        "load_average": [30.06, 17.91, 9.3],
        "hardware_concurrency": 24
    },
    "features": ["api", "asm", "http", "hwloc", "tls"],
    "results": {
        "diff_current": 488009,
        "shares_good": 8,
        "shares_total": 8,
        "avg_time": 22,
        "avg_time_ms": 22440,
        "hashes_total": 2418380,
        "best": [37554281, 2780415, 1877196, 899408, 499904, 154811, 138667, 53394, 0, 0],
        "error_log": []
    },
    "algo": "rx/0",
    "connection": {
        "pool": "pool.supportxmr.com:3333",
        "ip": "141.94.96.71",
        "uptime": 179,
        "uptime_ms": 179521,
        "ping": 41,
        "failures": 0,
        "tls": null,
        "tls-fingerprint": null,
        "algo": "rx/0",
        "diff": 488009,
        "accepted": 8,
        "rejected": 0,
        "avg_time": 22,
        "avg_time_ms": 22440,
        "hashes_total": 2418380,
        "error_log": []
    },
    "version": "6.21.2",
    "kind": "miner",
    "ua": "XMRig/6.21.2 (Linux x86_64) libuv/1.48.0 gcc/13.2.1",
    "cpu": {
        "brand": "AMD Ryzen 9 5900X 12-Core Processor",
        "family": 25,
        "model": 33,
        "stepping": 0,
        "proc_info": 10620688,
        "aes": true,
        "avx2": true,
        "x64": true,
        "64_bit": true,
        "l2": 6291456,
        "l3": 67108864,
        "cores": 12,
        "threads": 24,
        "packages": 1,
        "nodes": 1,
        "backend": "hwloc/2.10.0",
        "msr": "ryzen_19h",
        "assembly": "ryzen",
        "arch": "x86_64",
        "flags": ["aes", "vaes", "avx", "avx2", "bmi2", "osxsave", "pdpe1gb", "sse2", "ssse3", "sse4.1", "popcnt", "cat_l3"]
    },
    "donate_level": 1,
    "paused": false,
    "algorithms": ["cn/1", "cn/2", "cn/r", "cn/fast", "cn/half", "cn/xao", "cn/rto", "cn/rwz", "cn/zls", "cn/double", "cn/ccx", "cn-lite/1", "cn-heavy/0", "cn-heavy/tube", "cn-heavy/xhv", "cn-pico", "cn-pico/tlo", "cn/upx2", "rx/0", "rx/wow", "rx/arq", "rx/graft", "rx/sfx", "rx/keva", "argon2/chukwa", "argon2/chukwav2", "argon2/ninja", "ghostrider"],
    "hashrate": {
        "total": [10107.58, 10262.36, null],
        "highest": 10893.08,
        "threads": [
            [415.6, 430.39,