Problem: get unnecessary block result in header related api call

[mmsqe]

Closes: #XXX

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Attention: Patch coverage is 89.13043% with 5 lines in your changes missing coverage. Please review.

Project coverage is 46.52%. Comparing base (5acb559) to head (5e7fd8a).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
rpc/backend/blocks.go	85.29%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #535      +/-   ##
===========================================
+ Coverage    46.45%   46.52%   +0.07%     
===========================================
  Files          181      181              
  Lines        14477    14494      +17     
===========================================
+ Hits          6725     6744      +19     
+ Misses        7045     7036       -9     
- Partials       707      714       +7     

Files with missing lines	Coverage Δ
rpc/backend/account_info.go	81.57% <100.00%> (ø)
rpc/backend/call_tx.go	59.74% <100.00%> (ø)
rpc/backend/tracing.go	59.02% <100.00%> (ø)
rpc/backend/blocks.go	80.98% <85.29%> (-0.97%)	⬇️

... and 1 file with indirect coverage changes