Jkmarx/download url index bug

[jkmarx]

Resolves #2434
Fixes #2382
Fixes #2290

[jkmarx]

@scottx611x I had to change the logic in the search_indexes due to the None status being returned from the .get_datafile_url

[codecov]

Codecov Report

Merging #2462 into develop will decrease coverage by 0.71%.
The diff coverage is 92.5%.

@@            Coverage Diff             @@
##           develop   #2462      +/-   ##
==========================================
- Coverage    52.11%   51.4%   -0.72%     
==========================================
  Files          389     389              
  Lines        27441   27022     -419     
  Branches      1252    1246       -6     
==========================================
- Hits         14301   13890     -411     
+ Misses       13140   13132       -8

Impacted Files	Coverage Δ
...nery/ui/source/js/file-browser/services/factory.js	65.57% <ø> (-0.59%)	⬇️
refinery/file_store/tasks.py	39.68% <0%> (ø)	⬆️
...ui/source/js/user-file-browser/services/factory.js	89.7% <0%> (+0.23%)	⬆️
refinery/data_set_manager/tests.py	99.73% <100%> (-0.09%)	⬇️
refinery/data_set_manager/search_indexes.py	95.78% <100%> (+1.34%)	⬆️
refinery/tool_manager/models.py	96.42% <0%> (-0.01%)	⬇️
refinery/tool_manager/views.py	96.87% <0%> (ø)	⬆️
... and 2 more

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