Commits on Sep 11, 2019

1. Make stopPolling / startPolling a no-op after unmount …

   Polling is automatically stopped when a component is unmounted, so
   it isn't necessary to call `stopPolling` during component cleanup.
   If it is called though, we don't want to throw an exception, so
   these changes make it (and `startPolling`) a no-op if component
   cleanup has already happened.
   
   Fixes #3482

   

   hwillson committed Sep 11, 2019
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