fix(chat): Do not send message when empty or with only spaces (#311)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (862ed22) 96.30% compared to head (c5ed39b) 96.29%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #317 +/- ## ============================================ - Coverage 96.30% 96.29% -0.01% - Complexity 8861 8862 +1 ============================================ Files 1386 1386 Lines 22552 22554 +2 Branches 1393 1394 +1 ============================================ Hits 21719 21719 - Misses 632 634 +2 Partials 201 201 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.