fix: tokenClaimAirdrop throws NPE on null sender or receiver (cherry-pick)

[kimbor]

Description:
When submitting a tokenClaimAirdrop transaction, if one of the PendingAirdropIds in the list has an empty senderId or receiverId then the transaction fails catastrophically. This PR fixes the problem and add unit tests and hapi tests to verify the fix.

Related issue(s):
Fixes #17095
This PR is a cherry-pick of PR #17096

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7ffc174)	98472	64906	65.91%
Head commit (4d707c9)	98476 (+4)	64912 (+6)	65.92% (+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 (#17097)	4	4	100.00%

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

All modified and coverable lines are covered by tests ✅

Project coverage is 64.24%. Comparing base (7ffc174) to head (4d707c9).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #17097   +/-   ##
==========================================
  Coverage      64.24%   64.24%           
- Complexity     20817    20819    +2     
==========================================
  Files           2547     2547           
  Lines          95707    95711    +4     
  Branches       10014    10014           
==========================================
+ Hits           61485    61492    +7     
+ Misses         30610    30608    -2     
+ Partials        3612     3611    -1     

Files with missing lines	Coverage Δ
.../token/impl/handlers/TokenClaimAirdropHandler.java	76.85% <100.00%> (+0.79%)	⬆️

... and 1 file with indirect coverage changes

[lukelee-sl]

LGTM