Analytics: minor bugfixes

- Fixed a bug in the Filesink plugin that caused occasional crashes
- Fixed a bug in the Pusher REST API that prevented plugin reloads
for operators

analytics/operators/filesink/FilesinkOperator.cpp

@@ -70,7 +70,7 @@ void FilesinkOperator::compute(U_Ptr unit) {
         _buffer = _queryEngine.querySensor(in->getName(), 0, 0, _buffer);
         if(!_buffer || _buffer->empty())
             LOG(error) << "Operator " + _name + ": cannot read from sensor " + in->getName() + "!";
-        if(!in->writeFile(_buffer->at(_buffer->size()-1)))
+        else if(!in->writeFile(_buffer->at(_buffer->size()-1)))
             LOG(error) << "Operator " + _name + ": failed file write for sensor " << in->getName() << "!";
     }
 }

dcdbpusher/RestAPI.cpp

@@ -471,7 +471,7 @@ void RestAPI::unloadQueryEngine() {
     QueryEngine &qEngine = QueryEngine::getInstance();
     // Locking access to the QueryEngine
     qEngine.lock();
-    qEngine.setNavigator(nullptr);
+    //qEngine.setNavigator(nullptr);
     qEngine.setSensorMap(nullptr);
     
 }