removed some default cases

arangod/Aql/ExecutionBlock.h

@@ -1439,11 +1439,16 @@ namespace triagens {
               }
               return out;
             }
-            default: {
+            
+            case AqlValue::SHAPED: 
+            case AqlValue::EMPTY: {
+              // error
+              break;
+            }
+          }
+              
           THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, "unexpected value in variable to iterate over");
         }
-          }
-        }
 
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief current position in the _inVariable