Fix commit nil issue

[Manav-Aggarwal]

Overview

Fix uninitialized commit issue during SaveBlock in publishBlock

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #655 (092c9fb) into main (653d4bf) will increase coverage by 0.15%.
The diff coverage is 55.00%.

@@            Coverage Diff             @@
##             main     #655      +/-   ##
==========================================
+ Coverage   55.37%   55.52%   +0.15%     
==========================================
  Files          50       50              
  Lines       10293    10301       +8     
==========================================
+ Hits         5700     5720      +20     
+ Misses       3728     3719       -9     
+ Partials      865      862       -3     

Impacted Files	Coverage Δ
block/manager.go	67.07% <55.00%> (+0.16%)	⬆️
state/executor.go	69.68% <0.00%> (+0.73%)	⬆️
rpc/json/ws.go	61.90% <0.00%> (+7.93%)	⬆️
types/validation.go	50.00% <0.00%> (+13.63%)	⬆️

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[gupadhyaya]

LGTM

[tzdybal]

LGTM