throw error if optimizer expression parser doesn't return successfully or if...

throw error if optimizer expression parser doesn't return successfully or if not whole expression has been parsed

optimizer/Expression/Expression.h

@@ -176,7 +176,7 @@ private:
 
         bool success = phrase_parse(iter, end, expression, skipper, ast_);
 
-        if (success && iter != end) {
+        if (!success || iter != end) {
             std::cout << "Parsing failed!" << std::endl;
             throw new OptPilotException("Expression::parse()",
                                         "Parsing failed!");
@@ -191,4 +191,4 @@ private:
     }
 };
 
-#endif
+#endif
\ No newline at end of file