SpoilerLog Bug

[WaterKH]

[kh3-randomizer] [2022-04-30 16:18:20] fail: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost[111]
[kh3-randomizer] [2022-04-30 16:18:20] Unhandled exception in circuit 'q86J23NHUe8Sda0leUZigoFRMpXjl0S3MIXQ9TGUXWc'.
[kh3-randomizer] [2022-04-30 16:18:20] System.Text.Json.JsonException: 'P' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0.
[kh3-randomizer] [2022-04-30 16:18:20] ---> System.Text.Json.JsonReaderException: 'P' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.
[kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.ThrowHelper.ThrowJsonReaderException(Utf8JsonReader& json, ExceptionResource resource, Byte nextByte, ReadOnlySpan1 bytes) [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.Utf8JsonReader.ConsumeValue(Byte marker) [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.Utf8JsonReader.ReadFirstToken(Byte first) [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.Utf8JsonReader.ReadSingleSegment() [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.Utf8JsonReader.Read() [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
[kh3-randomizer] [2022-04-30 16:18:20] --- End of inner exception stack trace ---
[kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& state, JsonReaderException ex)
[kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.Serialization.JsonConverter1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state) [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.JsonSerializer.ReadCore[TValue](Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options) [kh3-randomizer] [2022-04-30 16:18:20] at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, Type returnType, JsonSerializerOptions options) [kh3-randomizer] [2022-04-30 16:18:20] at KH3Randomizer.Pages.SpoilerLog.LoadSpoilerLog(InputFileChangeEventArgs e) in /src/KH3Randomizer/Pages/SpoilerLog.razor:line 241 [kh3-randomizer] [2022-04-30 16:18:20] at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__140_0(Object state) [kh3-randomizer] [2022-04-30 16:18:20] at Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContext.ExecuteSynchronously(TaskCompletionSource1 completion, SendOrPostCallback d, Object state)
[kh3-randomizer] [2022-04-30 16:18:20] at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
[kh3-randomizer] [2022-04-30 16:18:20] --- End of stack trace from previous location ---
[kh3-randomizer] [2022-04-30 16:18:20] at Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContext.ExecuteBackground(WorkItem item)

Seems like this was thrown when someone uploaded the wrong file? Potentially add file check before processing.