gplugin/gplugin

Add some additional error checking to gplugin_native_loader_query

Testing Done:
Ran the unit tests

Reviewed at https://reviews.imfreedom.org/r/1848/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "gplugin/gplugin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "default"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False