fix: handle shortcuts by default if no WebPreferences object exists (#14766)

DevTools webcontents do not have webpreferences

Fixes #14685

spec/package.json

@@ -3,6 +3,9 @@
   "productName": "Electron Test",
   "main": "static/main.js",
   "version": "0.1.0",
+  "scripts": {
+    "postinstall": "node ../tools/run-if-exists.js node_modules/robotjs node-gyp rebuild"
+  },
   "devDependencies": {
     "basic-auth": "^2.0.0",
     "bluebird": "^3.5.1",
@@ -25,5 +28,8 @@
     "winreg": "^1.2.4",
     "ws": "^5.2.0",
     "yargs": "^11.0.0"
+  },
+  "optionalDependencies": {
+    "robotjs": "^0.5.1"
   }
 }