Fix Editor crash during first scan in headless import mode.

main/main.cpp

@@ -1653,6 +1653,9 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 			upwards = true;
 		} else if (arg == "--quit") { // Auto quit at the end of the first main loop iteration
 			quit_after = 1;
+#ifdef TOOLS_ENABLED
+			wait_for_import = true;
+#endif
 		} else if (arg == "--quit-after") { // Quit after the given number of iterations
 			if (N) {
 				quit_after = N->get().to_int();