nautils-search-engine-tracker: do not pass NULL to g_date_time_new_from_iso_8601

Merged Pablo Correa Gomez requested to merge pabloyoyoista/nautilus:glib-critical-fix into master

That function does not accept a NULL, fixing the critical:

GLib-CRITICAL **: 12:05:52.144: g_time_val_from_iso8601: assertion 'iso_date != NULL' failed

This is possible since tracker can return a NULL[1] "if the column is not in the [0,#ncolumns] range"


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