Fixing bugs found when trying out PG modifiers
Fixing bugs found when trying out PG modifiers

Argument parsing was not totally correct. I was also incorrectly taking
the result of the call as the new pgt, while in reality the modifier I
wrote for the SUMMIT demo simply modifies the given pgt object instead
of returning a potential copy

Signed-off-by: Rodrigo Tobar <bd955c861cbec2e41c0959cf13c7f573fa307e58@icrar.org>

steve-ord/daliuge,steve-ord/daliuge,steve-ord/daliuge,steve-ord/daliuge,steve-ord/daliuge,steve-ord/daliuge,steve-ord/daliuge