Exception triggered on new command-line parser

[flydev-fr]

I have been playing with the new command-line parser and when only the switch symbol is given as argument, an access violation is triggered, on Delphi and FPC.

Issue

$: Project1.exe /
EAccessViolation: Access violation

Expecting

Project1.exe / 
Unexpected / option

Usage: Project1 [options]
...

You can find a Delphi and FPC reproducible sample there: flydev-fr/mormot2-command-line-parser

Also just sent a PR #182

[synopse]

Perhaps linked to 38f27f08