Warnings with empty stderror

I keep receiving warnings with empty stderror messages after the test have run:

```
warn: Corvus.Testing.AzureFunctions.FunctionsController[0]
StdErr for process /usr/local/lib/node_modules/azure-functions-core-tools/bin/func host start --port 7075 --csharp, working directory /home/..../bin/Debug/net6.0:

info: Corvus.Testing.AzureFunctions.FunctionsController[0]
StdOut for process /usr/local/lib/node_modules/azure-functions-core-tools/bin/func host start --port 7075 --csharp, working directory /home/..../bin/Debug/net6.0: Output cleared at 26-01-2022 13:31:22

warn: Corvus.Testing.AzureFunctions.FunctionsController[0]
StdErr for process /usr/local/lib/node_modules/azure-functions-core-tools/bin/func host start --port 7075 --csharp, working directory /home/....../bin/Debug/net6.0: Output cleared at 26-01-2022 13:31:22

```

I am using version 1.5.0-253-unix-support.5.

Am I doing something wrong?

Start in FunctionsController, focusing on the process stderr and stdout logging shown for `func host start --port 7075 --csharp`. Reproduce with version 1.5.0-253-unix-support.5 and check whether empty output is logged as a warning. Done means empty stderr no longer produces misleading warnings while meaningful process output remains visible.

Written by the indexing model from the issue text.