only add smart attribute if its actually set

Author: dothebart

pyArango/database.py

@@ -158,10 +158,12 @@ def _checkCollectionList(lst) :
         payload = {
                 "name": name,
                 "edgeDefinitions": ed,
-                "orphanCollections": graphClass._orphanedCollections,
-                "isSmart": isSmart
+                "orphanCollections": graphClass._orphanedCollections
             }
 
+        if isSmart :
+                payload['isSmart'] = isSmart
+
         if options:
             payload['options'] = options