Fix report missing slices

[a-kore]

Fix

Short Description

• Fix handling of missing metrics between periodic report generations.

Tests Added

[codecov]

Codecov Report

Merging #518 (4788bb3) into main (03f6c5c) will decrease coverage by 0.10%.
The diff coverage is 16.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #518      +/-   ##
==========================================
- Coverage   64.45%   64.36%   -0.10%     
==========================================
  Files          94       94              
  Lines        9265     9282      +17     
==========================================
+ Hits         5972     5974       +2     
- Misses       3293     3308      +15     

Files	Coverage Δ
cyclops/report/utils.py	72.52% <16.66%> (-3.49%)	⬇️