core: Fix Dynamic Queries to search all fields for non existing field

Make sure that when searching for a field that doesn't appear we search the _with_tags
table.

Change-Id: I1aef8977331f9b3bd1d5003fbd9c7104b176eb92
Bug-Url: https://bugzilla.redhat.com/1114992
Signed-off-by: lzelkha@redhat.com <lzelkha@redhat.com>