Fixed coverage

Author: zhelgadis

Code/Epic.Query/Relational/Operations/InnerJoin.cs

@@ -89,8 +89,6 @@ public InnerJoin (Relation leftRelation, Relation rightRelation, Predicate predi
                 throw new ArgumentNullException("rightRelation");
             if (null == predicate)
                 throw new ArgumentNullException("predicate");
-            if (null == name)
-                throw new ArgumentNullException("name");
 
             this._leftRelation = leftRelation;
             this._rightRelation = rightRelation;