Add NotFound error exception

[Skaronator]

The /v1/job API consistently indicates the presence of a thumbnail for the current print, even in cases where none actually exists.

The Idea is that we just add a NotFound exception that will be thrown on the get_file() function when the thumbnail file doesn't exist. We can then handle the error in home assistant core to not showing a thumbnail.

Ref: home-assistant/core#104887

Code can be tested when you slice a simple cube in Prusa Slicer, while disabling all thumbnail generation. Then start that print and run this python script:

#!/bin/env python3
import aiohttp
import asyncio
from pyprusalink import PrusaLink


async def main():
    async with aiohttp.ClientSession() as session:
        api = PrusaLink(session, "http://prusaxl.fritz.box", "maker", "xy")
        job = await api.get_job()
        await api.get_file(job['file']['refs']['thumbnail'])


if __name__ == "__main__":
    asyncio.run(main())

This should be the output:

$ ./main.py 
Traceback (most recent call last):
  File "/home/niklas/Workspace/pyprusalink/./main.py", line 15, in <module>
    asyncio.run(main())
  File "/usr/lib/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/base_events.py", line 653, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/niklas/Workspace/pyprusalink/./main.py", line 11, in main
    await api.get_file(job['file']['refs']['thumbnail'])
  File "/home/niklas/Workspace/pyprusalink/pyprusalink/__init__.py", line 71, in get_file
    async with self.client.request("GET", path) as response:
  File "/usr/lib/python3.11/contextlib.py", line 204, in __aenter__
    return await anext(self.gen)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/niklas/Workspace/pyprusalink/pyprusalink/client.py", line 86, in request
    raise NotFound()
pyprusalink.types.NotFound

[agners]

Make sense, thanks 👍