Small fixes

[josenavas]

1. An error that I found on processing_job (the cmd variable was getting overwritten)
2. The odd button behavior that Austin reported

@antgonza @ElDeveloper a quick review/merge would be appreciated

[codecov-io]

Codecov Report

Merging #2434 into dev will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              dev    #2434   +/-   ##
=======================================
  Coverage   94.06%   94.06%           
=======================================
  Files         163      163           
  Lines       19347    19347           
=======================================
  Hits        18199    18199           
  Misses       1148     1148

Impacted Files	Coverage Δ
qiita_db/processing_job.py	93.04% <100%> (ø)	⬆️

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