fix: Add validation for grpc certificate hash

[Neeharika-Sompalli]

Fixes #16751

Adds validation that grpcCertificate hash is not empty

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 50.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (246f42d)	97509	63619	65.24%
Head commit (c7f2322)	97511 (+2)	63616 (-3)	65.24% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#16776)	2	1	50.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.53%. Comparing base (246f42d) to head (c7f2322).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...e/addressbook/impl/handlers/NodeUpdateHandler.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #16776      +/-   ##
=============================================
- Coverage      63.54%   63.53%   -0.01%     
+ Complexity     20372    20370       -2     
=============================================
  Files           2537     2537              
  Lines          94744    94746       +2     
  Branches        9901     9902       +1     
=============================================
- Hits           60201    60198       -3     
- Misses         30936    30941       +5     
  Partials        3607     3607              

Files with missing lines	Coverage Δ
...e/addressbook/impl/handlers/NodeUpdateHandler.java	93.24% <50.00%> (+0.18%)	⬆️

... and 10 files with indirect coverage changes

[tinker-michaelj]

LGTM, tyvm @Neeharika-Sompalli !