Bruno Leroux 7001e5cc63 [Android] Fix KeyEmbedderResponder throws a NullPointerException (flutter/engine#49860)
## Description

This PR fixes a `NullPointerException` thrown from `KeyEmbedderResponder` when pressing a key during a hot restart (at this time the framework might not be ready and null reply is sent back).

## Related Issue

Fixes https://github.com/flutter/flutter/issues/141662.

## Tests

Adds 1 test.
2024-01-19 09:17:06 +00:00
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