Incomplete GSV sentence can be parsed

[FeirZhang]

Incomplete GSV sentence, e.g. $GLGSV,1,1,04,87,45,004,39,72,43,088,39,65,32,147,41,78,31,299,40,8 can be parsed,
it should throw 'ParseError' during parsing like $GLGSV,1,1,04,87,45,004,39,72,43,088,39,65,32,147,41,78,31,299,40,8*

[barbacbd]

When calling parse you can provide a second parameter set to True. It defaults to False. When true the software will skip the checksum checks. Really this should be the default so that false positives are not provided