Fix flowparse when no file is specified.
Fix flowparse when no file is specified.

scholzd/MoonGen,gallenmu/MoonGen,emmericp/MoonGen,gallenmu/MoonGen,gallenmu/MoonGen,gallenmu/MoonGen,dschoeffm/MoonGen,gallenmu/MoonGen,dschoeffm/MoonGen,scholzd/MoonGen,gallenmu/MoonGen,gallenmu/MoonGen,scholzd/MoonGen,emmericp/MoonGen,gallenmu/MoonGen,dschoeffm/MoonGen,emmericp/MoonGen