Comment 2 for bug 1025355

StacktraceTop:
 g_assertion_message (domain=domain@entry=0x0, file=file@entry=0x7f692fa5b133 "yelp-document.c", line=line@entry=1214, func=func@entry=0x7f692fa5b5b0 "yelp_document_error_pending", message=<optimized out>) at /build/buildd/glib2.0-2.33.3/./glib/gtestutils.c:1861
 g_assertion_message_expr (domain=domain@entry=0x0, file=file@entry=0x7f692fa5b133 "yelp-document.c", line=line@entry=1214, func=func@entry=0x7f692fa5b5b0 "yelp_document_error_pending", expr=expr@entry=0x7f692fa5aee8 "document != NULL && YELP_IS_DOCUMENT (document)") at /build/buildd/glib2.0-2.33.3/./glib/gtestutils.c:1872
 yelp_document_error_pending (document=document@entry=0x0, error=error@entry=0x197eb60) at yelp-document.c:1214
 mallard_think (mallard=0x1a3f9c0) at yelp-mallard-document.c:348
 g_thread_proxy (data=0x1b66590) at /build/buildd/glib2.0-2.33.3/./glib/gthread.c:801