Make sure get_dataset_path returns Path, fix event source test, fixes #1517

[maxnoe]

fixes #1517

[codecov]

Codecov Report

Merging #1519 (2adc638) into master (e6ddf72) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1519      +/-   ##
==========================================
- Coverage   90.41%   90.41%   -0.01%     
==========================================
  Files         194      194              
  Lines       13867    13860       -7     
==========================================
- Hits        12538    12531       -7     
  Misses       1329     1329              

Impacted Files	Coverage Δ
ctapipe/utils/datasets.py	90.09% <0.00%> (ø)
ctapipe/io/tests/test_event_source.py	96.46% <100.00%> (-0.21%)	⬇️

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[HealthyPear]

sorry I didn't get it from the issue: is input_url supposed to overwrite the dataset in config or the other way around?

[maxnoe]

It is supposed to. More explicit should override less explicit. So kwarg overrides config overrides default.

[maxnoe]

Sorry, I mixed two things here, which where connected on my machine.

This is both the fix for #1517 and the issue mentioned in the title that get_dataset_path would return a str when it found the file in ctapipe-extra and a Path if found anywhere else.