Missing priority description would prevent successful loading of...

Missing priority description would prevent successful loading of populate_metadata.sql into xref dataabase.

misc-scripts/xref_mapping/xref_config.ini

@@ -1042,6 +1042,7 @@ name            = VGNC
 download        = Y
 order           = 29
 priority        = 1
+prio_descr	= 
 parser          = HGNCParser
 release_uri     =
 data_uri        = file:VGNC_to_Ensembl_mapping.txt.gz