No more ajax error when not logged in (facets still empty, though)

[mccalluc]

No description provided.

[codecov-io]

Codecov Report

Merging #1864 into develop will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           develop   #1864      +/-   ##
==========================================
+ Coverage    41.41%   41.5%   +0.09%     
==========================================
  Files          400     400              
  Lines        25974   26045      +71     
  Branches      1284    1303      +19     
==========================================
+ Hits         10756   10811      +55     
- Misses       15218   15234      +16

Impacted Files	Coverage Δ
refinery/data_set_manager/utils.py	54.82% <100%> (+0.08%)	⬆️
refinery/user_files_manager/tests.py	100% <100%> (ø)	⬆️
refinery/user_files_manager/views.py	61.53% <0%> (-0.63%)	⬇️
.../tool-launch/services/file-relationship-service.js	77.29% <0%> (+0.31%)	⬆️

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