fix(server): Prevent doNotCache error when an exception occurs during a cache miss

[nellh]

It's expected that Redis cache items cache miss function may fail on the first call. The miss should be retried but this would always fail because of the missing doNotCache signal. This fix calls the cache miss and passes in the required signal but ignores it. If the second miss fails, the error is handled by the caller.

Adds a test for this case and now logs the failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.68%. Comparing base (1d2173d) to head (a261074).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3248      +/-   ##
==========================================
+ Coverage   45.65%   45.68%   +0.02%     
==========================================
  Files         595      595              
  Lines       38012    38014       +2     
  Branches     1167     1171       +4     
==========================================
+ Hits        17356    17366      +10     
+ Misses      20459    20451       -8     
  Partials      197      197              

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