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/
if get_option('nls')
i18n.gettext(GETTEXT_PACKAGE, preset: 'glib')
else
summary('translations',
'You have disabled installation of translations which means ' +
'English will be the only available language.',
section : 'Warnings')
endif