Fix an AttributeError raised when a URL is used as a species

[jwodder]

No description provided.

[codecov]

Codecov Report

Merging #782 (731686c) into master (27dd3e7) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #782      +/-   ##
==========================================
- Coverage   85.22%   85.04%   -0.19%     
==========================================
  Files          59       59              
  Lines        6039     6039              
==========================================
- Hits         5147     5136      -11     
- Misses        892      903      +11     

Flag	Coverage Δ
unittests	85.04% <100.00%> (-0.19%)	⬇️

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Impacted Files	Coverage Δ
dandi/tests/test_metadata.py	100.00% <ø> (ø)
dandi/metadata.py	82.17% <100.00%> (+2.50%)	⬆️
dandi/support/generatorify.py	0.00% <0.00%> (-16.10%)	⬇️
dandi/dandiarchive.py	82.23% <0.00%> (-1.53%)	⬇️
dandi/download.py	81.69% <0.00%> (-0.55%)	⬇️
dandi/dandiapi.py	92.46% <0.00%> (-0.20%)	⬇️

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[yarikoptic]

Thank you @jwodder! Could you please adjust the title to summarize actual change/fix so it could be self sufficient in CHANGELOG etc.

[jwodder]

@yarikoptic Adjusted.

[yarikoptic]

cool, thank you! Let's proceed. I will not rush to release ATM