[Mobile] Fix crash on undefined image url#15532

Merged

mkevins merged 4 commits intornmobile/master-fork-before-richtext-selection-state-changefrom

rnmobile/hotfix-crash-on-undefined-image-url

May 12, 2019

Commits on May 9, 2019

Add safety check to image url before calling indexOf
mkevins
committed

Commits on May 10, 2019

Set attributes.id to null when an image upload is cancelled
mkevins
committed
Add console.warn and comments to help track WordPress-Android issue #9768
mkevins
committed

Commits on May 12, 2019

Fix lint errors
mkevins
committed