Printhost: Minor bugfix

src/slic3r/Utils/PrintHost.cpp

@@ -138,7 +138,7 @@ void PrintHostJobQueue::priv::bg_thread_main()
     } catch (const std::exception &e) {
         emit_error(e.what());
     } catch (...) {
-        wxTheApp->OnUnhandledException();
+        emit_error("Unknown exception");
     }
 
     // Cleanup leftover files, if any