No output for unknown options

[prochan2]

When I execute the tool with the same options as I use for AzureSignTool, I got no output. Just the return code is -1.

(Custom build of commit d2a1834 from master branch.)

(I've realized that the breaking option is --verbose. Which in this case has an opposite effect than one would expect :) )

[mrlioncub]

Example:

> NuGetKeyVaultSignTool --test
> $LastExitCode
0