[native] Return without error if avatar image selection is empty
Summary:
Context: https://linear.app/comm/issue/ENG-3803/error-message-when-user-exits-the-select-image-flow-for-avatar
We want to return silently instead of throwing exception + displaying alert.
Test Plan:
- Select image
- Close image gallery without picking an image
- Observe no alert
Reviewers: ashoat, ginsu
Reviewed By: ginsu
Subscribers: tomek
Differential Revision: https://phab.comm.dev/D7638