It should be a moc error for the specified file to not exist.

Currently the missing file is ignored and plugin data is created anyway.

Change-Id: I118fd57b7d05a135e3ff58c0298b25e67cd12587
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/tools/moc/moc.cpp

@@ -1107,7 +1107,7 @@ void Moc::parsePluginData(ClassDef *def)
                 msg += "Plugin Metadata file ";
                 msg += lexem();
                 msg += " does not exist. Declaration will be ignored";
-                warning(msg.constData());
+                error(msg.constData());
                 return;
             }
             QFile file(fi.canonicalFilePath());