adopted-ember-addons / adopted-ember-addons/ember-paper

paper-tooltip: sometimes causes error `Cannot read property 'classList' of undefined`

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JavaScript
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描述

Hovering on/off tooltip elements quickly will sometimes cause the error `Cannot read property 'classList' of undefined`.

Stack trace:
```
transition-mixin.js:108 Uncaught TypeError: Cannot read property 'classList' of undefined
at Class.removeClass (transition-mixin.js:108)
at nextTick.then (transition-mixin.js:142)
at tryCatcher (rsvp.js:200)
at invokeCallback (rsvp.js:372)
at publish (rsvp.js:358)
at rsvp.js:14
at invoke (backburner.js:205)
at Queue.flush (backburner.js:125)
at DeferredActionQueues.flush (backburner.js:278)
at Backburner.end (backburner.js:410)
```

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