[backend] Delete notblank annotation

[savacano28]

Proposed changes

Related issues

• Closes #ISSUE-NUMBER

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.76%. Comparing base (f9b0e5b) to head (98d1a0a).
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1931      +/-   ##
============================================
- Coverage     33.80%   33.76%   -0.05%     
- Complexity     1686     1687       +1     
============================================
  Files           572      572              
  Lines         16679    16702      +23     
  Branches        968      972       +4     
============================================
+ Hits           5638     5639       +1     
- Misses        10786    10808      +22     
  Partials        255      255              

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