[Bug]: warszawa19115.pl cant pull data from API

[krystjanik]

I Have A Problem With:

A specific source

What's Your Problem

When trying configure addon on my location (which has been working flawlessly for a long time) got error:
"The source returned an invalid response: "object of type 'NoneType' has no len()". Please check the provided arguments and try again."

Source (if relevant)

warszawa19115_pl

Logs

No response

Relevant Configuration

No response

Checklist Source Error

• Use the example parameters for your source (often available in the documentation) (don't forget to restart Home Assistant after changing the configuration)
• Checked that the website of your service provider is still working
• Tested my attributes on the service provider website (if possible)
• I have tested with the latest version of the integration (master) (for HACS in the 3 dot menu of the integration click on "Redownload" and choose master as version)

Checklist Sensor Error

• Checked in the Home Assistant Calendar tab if the event names match the types names (if types argument is used)

Required

• I have searched past (closed AND opened) issues to see if this bug has already been reported, and it hasn't been.
• I understand that people give their precious time for free, and thus I've done my very best to make this problem as easy as possible to investigate.

[MarcinGmurczyk]

Same here
```File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source_shell.py", line 158, in fetch entries: Iterable[Collection] = self._source.fetch() ^^^^^^^^^^^^^^^^^^^^ File "/config/custom_components/waste_collection_schedule/waste_collection_schedule/source/warszawa19115_pl.py", line 127, in fetch or len(calendar_result[0]["harmonogramy"]) <= 0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ TypeError: object of type 'NoneType' has no len()`

[miedzeszyn]

And same here.
I suspect some API changed as ZTM transport also stop working few days ago.