fix result not present in telegram api response

[jerryfletcher21]

What does this PR do?

While running the coordinator I got:

File ".../api/management/commands/telegram_watcher.py", line 42, in handle
    if not response["result"]:
           ~~~~~~~~^^^^^^^^^^
KeyError: 'result'

This PR adds a check that "result" is present in response.
I think the check already present was meant for this case, but it checks if response["result"] is True/False.

Checklist before merging

• Install pre-commit and initialize it: pip install pre-commit, then pre-commit install. Pre-commit installs git hooks that automatically check the codebase. If pre-commit fails when you commit your changes, please fix the problems it points out.