[Enterprise Search] Fix various plugin states when app has error connecting to Enterprise Search#78091

Merged

cee-chen merged 2 commits intoelastic:masterfrom cee-chen:error-connecting-fixes

Sep 22, 2020

+95-8

Commits on Sep 21, 2020

Display error connecting prompt on Overview page instead of blank page
cee-chen
committed
Fix App Search and Workplace Search to not crash during error connecting
cee-chen
committed