Fix #82 -- Handle bad request errors and feed them back to the user

[herrbenesch]

How to test

• Setup alpha sam
  1. Upload a png file in a private chat
  2. Upload a pdf file in a private chat and add no message

Open question

• Does currently not work within a group chat. Even if sam is addressed directly. I'm not sure we need this. And if we need it, I'm not sure how to address it.

[codecov[bot]]

Codecov Report

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

Project coverage is 95.89%. Comparing base (5474974) to head (0457893). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ========================================== + Coverage 95.83% 95.89% +0.06% ========================================== Files 19 19 Lines 600 609 +9 ========================================== + Hits 575 584 +9 Misses 25 25 ```

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[herrbenesch]

@codingjoe thanks for the review. I'm now feeding back the error messages to the assistant in order to receive a nicely formatted issue description.

[herrbenesch]

thanks @codingjoe