Fallback to the name of an app info if there's no executable

Apparently on Windows command line and executable can be NULL,
but the name appears to be the executable name.

katze/katze-utils.c

@@ -104,6 +104,8 @@ katze_app_info_get_commandline (GAppInfo* info)
     #endif
     if (!exe)
         exe = g_app_info_get_executable (info);
+    if (!exe)
+        exe = g_app_info_get_name (info);
     return exe;
 }