Fix:SignBytes representation of empty string data field in the event-…

[VAIBHAVJINDAL3012]

Description

In v0.2.11 -> v0.2.12 transition, algorithm for the string conversion of HexBytes for the data field of event-record was changed. It impacted the conversion in the case when the HexBytes represented the empty string.Due to this it was causing the sync issue. This PR includes changes which rectified that issue "
I would like to thank @svenski123 for reporting this issue and also putting his effort to research out the best solution for this.
#1004

Changes

• Bugfix (non-breaking change that solves an issue)
• [.] Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Nodes audience

This PR change should be applied to all the nodes who are syncing from the scatch

Checklist

• [.] I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• [.] I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply

[codecov]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.02 ⚠️

Comparison is base (784f0f0) 75.41% compared to head (ad15687) 75.40%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1016      +/-   ##
===========================================
- Coverage    75.41%   75.40%   -0.02%     
===========================================
  Files           49       49              
  Lines         5296     5309      +13     
===========================================
+ Hits          3994     4003       +9     
- Misses        1068     1071       +3     
- Partials       234      235       +1     

Impacted Files	Coverage Δ
auth/ante.go	81.42% <80.00%> (-0.46%)	⬇️

... and 1 file with indirect coverage changes

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