Cleanup

agui2/src/Execution/ParallelExecutor.cpp

@@ -20,7 +20,6 @@ std::shared_ptr<abstraction::OperationAbstraction> ParallelExecutor::execute(Out
     }
     // collect all boxes leading to the output box
-    // TODO validate this
     std::vector<ModelBox*> boxes;
     boxes.push_back(output);
@@ -35,9 +34,8 @@ std::shared_ptr<abstraction::OperationAbstraction> ParallelExecutor::execute(Out
         for (auto* b: box->inputs) {
             if (!b) {
                 // unconnected input
-                // TODO move this elsewhere
+                // TODO check this earlier
                 throw exception::CommonException { "Connection graph contains an unconnected input." };
-                return nullptr;
             }
             boxes.push_back(b);
         }