LGTM.com - false positive with null checks in C#

[ThadHouse]

A null check and throw in C# before a sensitive method is detected as an error. This should not result in an error, as removing it would then make an NRE happen when we deref, which is much worse for debugging

https://lgtm.com/projects/g/microsoft/msquic/snapshot/9a3f71038c6dc2b1c80a6b59e9f43bcd92ea4254/files/src/perf/dbserver/Controllers/PerformanceController.cs?sort=name&dir=ASC&mode=heatmap#xfd2d1b7771fa1935:1