fix: assignment to entry in nil map with @Header all #1082

[ubogdan]

Describe the PR
fix assignment to entry in nil map with @Header all

Relation issue
#1082

Additional context
NONE

[codecov]

Codecov Report

Merging #1085 (041892d) into master (9d81576) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
- Coverage   94.22%   94.22%   -0.01%     
==========================================
  Files           9        9              
  Lines        2321     2320       -1     
==========================================
- Hits         2187     2186       -1     
  Misses         70       70              
  Partials       64       64              

Impacted Files	Coverage Δ
operation.go	95.88% <100.00%> (-0.01%)	⬇️

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