fix TypeError in Chrome from GamepadPlugin.stopListeners. It is calli…

[cryonautlex]

…ng the removeAllListeners method on undefined.

This PR

• Fixes a bug

The gamepad plugin's gamepads array sometimes has undefined values in it, especially in Chrome. Here is a stack trace:

Cannot read properties of undefined (reading 'removeAllListeners')
TypeError: Cannot read properties of undefined (reading 'removeAllListeners')
    at GamepadPlugin.stopListeners (webpack-internal:///./node_modules/phaser/dist/phaser.js:112078:30)
    at GamepadPlugin.shutdown (webpack-internal:///./node_modules/phaser/dist/phaser.js:112275:14)
    at EventEmitter.emit (webpack-internal:///./node_modules/phaser/dist/phaser.js:213:33)
    at InputPlugin.shutdown (webpack-internal:///./node_modules/phaser/dist/phaser.js:107171:27)
    at EventEmitter.emit (webpack-internal:///./node_modules/phaser/dist/phaser.js:215:33)
    at Systems.shutdown (webpack-internal:///./node_modules/phaser/dist/phaser.js:201414:16)
    at SceneManager.stop (webpack-internal:///./node_modules/phaser/dist/phaser.js:198962:23)
    at SceneManager.processQueue (webpack-internal:///./node_modules/phaser/dist/phaser.js:197975:27)
    at SceneManager.update (webpack-internal:///./node_modules/phaser/dist/phaser.js:198219:14)
    at Game.step (webpack-internal:///./node_modules/phaser/dist/phaser.js:17199:20)

This adds a simple if around the call to removeAllListeners to make sure it's not falsy.

[photonstorm]

I don't mind adding a guard around it, but I wonder what on earth is causing it to have an undefined entry in the first place.

[photonstorm]

Ok, closing this as resolved via a9164a9 as it needed applying to disconnectAll as well.