Resolve loading error.

[jkmarx]

Resolves #3210

[codecov]

Codecov Report

Merging #3344 into develop will decrease coverage by 0.41%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #3344      +/-   ##
===========================================
- Coverage    68.94%   68.53%   -0.42%     
===========================================
  Files          372      372              
  Lines        24541    24225     -316     
  Branches       942      942              
===========================================
- Hits         16921    16602     -319     
- Misses        7620     7623       +3

Impacted Files	Coverage Δ
refinery/core/serializers.py	87.7% <0%> (-5.02%)	⬇️
refinery/data_set_manager/urls.py	100% <0%> (ø)	⬆️
refinery/core/test_views.py	100% <0%> (ø)	⬆️
refinery/analysis_manager/urls.py	100% <0%> (ø)	⬆️
refinery/tool_manager/urls.py	100% <0%> (ø)	⬆️
refinery/core/test_serializers.py	100% <0%> (ø)	⬆️
refinery/core/urls.py	100% <0%> (ø)	⬆️
refinery/annotation_server/urls.py	100% <0%> (ø)	⬆️

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