Fix bad comparison of real type vs string

[dtasev]

Summary of work

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Additional comments

Fixes #xyz

Before merging ensure the release notes have been updated

[codecov]

Codecov Report

Merging #1323 (69ccf00) into Autoreduction-v21.1 (015769a) will increase coverage by 0.07%.
The diff coverage is 80.00%.

@@                   Coverage Diff                   @@
##           Autoreduction-v21.1    #1323      +/-   ##
=======================================================
+ Coverage                53.45%   53.53%   +0.07%     
=======================================================
  Files                      112      112              
  Lines                     4357     4360       +3     
  Branches                   545      546       +1     
=======================================================
+ Hits                      2329     2334       +5     
+ Misses                    1982     1981       -1     
+ Partials                    46       45       -1     

Impacted Files	Coverage Δ
...pp/autoreduce_webapp/instrument/views/variables.py	0.00% <0.00%> (ø)
...ssors/queue_processor/instrument_variable_utils.py	99.15% <100.00%> (+0.02%)	⬆️
queue_processors/queue_processor/variable_utils.py	97.53% <0.00%> (+2.46%)	⬆️

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