fix(minor-interchain-token-service): ignore empty event attributes

[milapsheth]

Description

AXE-5913

Todos

• Unit tests
• Manual tests
• Documentation
• Connect epics/issues

Steps to Test

Expected Behaviour

Other Notes

[codecov]

Codecov Report

Attention: Patch coverage is 98.90710% with 4 lines in your changes missing coverage. Please review.

Project coverage is 93.73%. Comparing base (81b6061) to head (535c34e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/axelar-wasm-std/src/nonempty/hexbinary.rs	86.20%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #656      +/-   ##
==========================================
+ Coverage   93.69%   93.73%   +0.04%     
==========================================
  Files         243      244       +1     
  Lines       35678    35875     +197     
==========================================
+ Hits        33427    33628     +201     
+ Misses       2251     2247       -4     

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