libtracker-sparql: Add specific error code for missing nrl:lastModified and incomplete properties

Carlos Garnachorequested to merge
wip/carlosg/new-error-codes into master

Add a new error code for these specific error situation when parsing the database ontology. Based on code by Abanoub Ghadban abanoub.gdb@gmail.com.

Related: https://gitlab.gnome.org/GNOME/tracker/-/merge_requests/452

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