Fix BAM index file generation

[hackdna]

No description provided.

[codecov]

Codecov Report

Merging #2712 into develop will decrease coverage by 4.49%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           develop    #2712     +/-   ##
==========================================
- Coverage    59.87%   55.37%   -4.5%     
==========================================
  Files          399      399             
  Lines        28275    25211   -3064     
  Branches      1239     1239             
==========================================
- Hits         16929    13961   -2968     
+ Misses       11346    11250     -96

Impacted Files	Coverage Δ
refinery/core/tests.py	99.51% <ø> (-0.29%)	⬇️
refinery/data_set_manager/tasks.py	43.23% <0%> (ø)	⬆️
refinery/file_store/models.py	70.76% <100%> (+1.29%)	⬆️
refinery/core/serializers.py	73.17% <66.66%> (-1.53%)	⬇️
refinery/core/tasks.py	0% <0%> (-11.77%)	⬇️
refinery/core/models.py	69.97% <0%> (-5.93%)	⬇️
refinery/core/admin.py	83.72% <0%> (-2.68%)	⬇️
refinery/tool_manager/views.py	96.19% <0%> (-1.13%)	⬇️
refinery/tool_manager/models.py	96.58% <0%> (-0.69%)	⬇️
... and 8 more

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