fix entity tree reset / add OST assert for myServer

assignment-client/src/Agent.cpp

@@ -224,5 +224,9 @@ void Agent::run() {
 
 void Agent::aboutToFinish() {
     _scriptEngine.stop();
+
+    // our entity tree is going to go away so tell that to the EntityScriptingInterface
+    DependencyManager::get<EntityScriptingInterface>()->setEntityTree(NULL);
+    
     NetworkAccessManager::getInstance().clearAccessCache();
 }

assignment-client/src/octree/OctreeSendThread.cpp

@@ -68,6 +68,9 @@ bool OctreeSendThread::process() {
 
     quint64  start = usecTimestampNow();
 
+    // we'd better have a server at this point, or we're in trouble
+    assert(_myServer);
+
     // don't do any send processing until the initial load of the octree is complete...
     if (_myServer->isInitialLoadComplete()) {
         if (_node) {