Output error message if pxd comment is found that can't be parsed (e.g., extra space after : )

[timosachsenberg]

Happened a few times and is probably easy to fix in autowrap.

[hroest]

@timosachsenberg you could simply remove the check for empty values here on line 142 and therefore allow empty values which a user could now generate with "wrap-x: wrap-y: Now some stuff here":

https://github.com/OpenMS/autowrap/blob/84e19fb094d628a7446120873c6819e79296bb3c/autowrap/PXDParser.py#L140-L150