NSInvalidArgumentException: *** -[NSURL initFileURLWithPath:]: nil string parameter

[sentry-io]

Sentry Issue: JETPACK-IOS-1521

NSInvalidArgumentException: *** -[NSURL initFileURLWithPath:]: nil string parameter
  ?, in -[RCTVideo playerItemForSource:withCallback:]
  ?, in __19-[RCTVideo setSrc:]_block_invoke
  File "main.swift", line 7, in main
...
(12 additional frame(s) were not displayed)

Description

The associated UI test uncovered this crash because the rate at which it types a valid URL results in lost characters. I.e. http://valid.com/url.mp4 is typed, but h://valid.com/url.mp4 is captured.

So, there are two issue:

1. Characters are dropped when typing rapidly.
2. Invalid URLs result in crashes.

Steps to Reproduce

1. Add a Video block.
2. Choose "Insert from URL."
3. Type h://bogus.com/v.mp4.
4. Dismiss the bottom sheet.