MAINT-871 Fix for freeze on shutdown while calculating weights and fees of a mesh.

indra/newview/llmeshrepository.cpp

@@ -1659,7 +1659,7 @@ void LLMeshUploadThread::requestWholeModelFee()
 		mCurlRequest->process();
 		//sleep for 10ms to prevent eating a whole core
 		apr_sleep(10000);
-	} while (mCurlRequest->getQueued() > 0);
+	} while (!LLApp::isQuitting() && mCurlRequest->getQueued() > 0);
 
 	delete mCurlRequest;
 	mCurlRequest = NULL;