StringIndexOutOfBoundsException when calling usage with empty command name

[jansohn]

If the name attribute of the @Command annotation is set to an empty string (or space) and usage() is called the following exception is thrown:

java.lang.StringIndexOutOfBoundsException: String index out of range: -5
	at java.lang.String.substring(String.java:1931)
	at picocli.CommandLine$Help.detailedSynopsis(CommandLine.java:2637)
	at picocli.CommandLine$Help.synopsis(CommandLine.java:2536)
	at picocli.CommandLine.usage(CommandLine.java:427)
	at picocli.CommandLine.usage(CommandLine.java:387)
	at picocli.CommandLine.usage(CommandLine.java:377)

I think it's a valid use case to set the name to an empty string.

[remkop]

Thanks for raising this! I was able to reproduce the issue and I'm looking at it now.

[remkop]

Fixed in master. Please verify.
Thanks again for raising this!

[jansohn]

Works, thanks for fixing this!

[remkop]

Thanks for verifying. Will look at #201 next.