Summary: `getChilAt` can return `null` (see also line 671), probably when the UI changes during the inspection process. Added a null check that should protect against the failure reported in P501013941 Changelog: Fixed NPE during search in layout plugin (Android) Reviewed By: lblasa Differential Revision: D36369508 fbshipit-source-id: 1f066d1a73bdfe875d66f7200ded0d0776af8321