Crash On Empty Config File

[Kurt-von-Laven]

CSharpier crashes with the following stack trace when run with an empty .csharpierrc.yaml:

$ dotnet tool run dotnet-csharpier .
Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
   at CSharpier.ConfigurationFileOptions.CreatePrinterOptions(String baseDirectoryPath, IFileSystem fileSystem) in /home/runner/work/csha
rpier/csharpier/Src/CSharpier/ConfigurationFileOptions.cs:line 27
   at CSharpier.CommandLineFormatter.<>c__DisplayClass9_0.<<Format>g__CreateFormatter|0>d.MoveNext() in /home/runner/work/csharpier/cshar
pier/Src/CSharpier/CommandLineFormatter.cs:line 69
--- End of stack trace from previous location ---
   at CSharpier.CommandLineFormatter.Format(CommandLineOptions commandLineOptions, IFileSystem fileSystem, IConsole console, Cancellation
Token cancellationToken) in /home/runner/work/csharpier/csharpier/Src/CSharpier/CommandLineFormatter.cs:line 118
   at CSharpier.Program.Run(String[] directoryOrFile, Boolean check, Boolean fast, Boolean skipWrite, Boolean writeStdout, CancellationTo
ken cancellationToken) in /home/runner/work/csharpier/csharpier/Src/CSharpier/Program.cs:line 68
   at System.CommandLine.Invocation.CommandHandler.GetResultCodeAsync(Object value, InvocationContext context)
   at System.CommandLine.Invocation.ModelBindingCommandHandler.InvokeAsync(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<UseParseErrorReporting>b__21_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass16_0.<<UseHelp>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass25_0.<<UseVersionOption>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass23_0.<<UseTypoCorrections>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__22_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<UseParseDirective>b__20_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<UseDebugDirective>b__11_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<RegisterWithDotnetSuggest>b__10_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass14_0.<<UseExceptionHandler>b__0>d.MoveNext()

Instead it should probably display a helpful warning that the config file was empty?