Fix false error if more then one function have same name.

src/object.cpp

@@ -170,7 +170,7 @@ const ObjectBase* Evaluate(ExecExpr& exp, bool* err)
     exp.erase(pr);
 
     // Error handling
-    if(!errl.empty())
+    if( res==nullptr || res->isError() )
     {
      const struct grammatic_location& loc=cse->Location();
      *err=true; // Raise error flag