Fixed: Don't try to convert next meshes if an error occurs

--HG--
branch : develop

code/nel/tools/3d/mesh_export/main.cpp

@@ -78,6 +78,8 @@ int main(int argc, char *argv[])
 			settings.ToolErrorLog = settings.DestinationDirectoryPath + "error.log";
 
 		res = exportScene(settings);
+
+		if (res != EXIT_SUCCESS) break;
 	}
 
 	return res;