fix introduced bug in OutputManger

corsika/detail/output/OutputManager.inl

@@ -47,7 +47,7 @@ namespace corsika {
   template <typename TOutput>
   inline void OutputManager::add(std::string const& name, TOutput& output) {
 
-    if (state_ == OutputState::NoInit) {
+    if (state_ != OutputState::NoInit) {
       // if "add" is called after the ouptput has started, this is an ERROR.
       CORSIKA_LOGGER_ERROR(
           logger_, "Cannot add more outputs to OutputManager after output was started.");