LINQ to SPARQL bugfix

Bug fixed for LINQ queries where one property was used in alternatively
exlcuding conditions (i.e. property value is literal or null) resulting
in a wrong SPARL query.
LINQ to SPARQL bugfix

Corrected an issue when a same property was used in alternating exluding
conditions (i.e. property.contains or not property.any) for non-entity
based enumerable properties.