Some invalid options show "is unrecognized" while some crash the process

[ProductiveRage]

I accidentally used "/P" instead of "/PW" and got an exception thrown:

Unhandled Exception: Microsoft.FSharp.Core.MatchFailureException: The match cases were incomplete
at SQLient.CommandLine.parseCommandLineRec(FSharpList1 args, CommandLineOptions optionsSoFar) in C:\Users\droberts\Documents\GitHub\sqlient\SQLient\CommandLine.fs:line 38 at SQLient.CommandLine.parseCommandLine(FSharpList1 args) in C:\Users\droberts\Documents\GitHub\sqlient\SQLient\CommandLine.fs:line 63
at SQLient.Main.main(String[] args) in C:\Users\droberts\Documents\GitHub\sqlient\SQLient\Program.fs:line 27

Trying another invalid option ("/O", selected for no reason of than it was the key next to "P") does not result in an exception, instead the following is displayed -

Option '/O' is unrecognized
Error. "Server needs to be specified