Early return function BeginBlocker

[neitdung]

1. Summary

Fixes #702

2.Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

3. Implementation details

4. How to test/use

5. Checklist

• Does the Readme need to be updated?

6. Limitations (optional)

7. Future Work (optional)

[codecov]

Codecov Report

Merging #705 (2095b53) into main (5adcf20) will decrease coverage by 0.01%.
The diff coverage is 48.14%.

@@            Coverage Diff             @@
##             main     #705      +/-   ##
==========================================
- Coverage   13.40%   13.40%   -0.01%     
==========================================
  Files         243      243              
  Lines       63040    63049       +9     
==========================================
  Hits         8452     8452              
- Misses      53913    53919       +6     
- Partials      675      678       +3     

Flag	Coverage Δ
unittests	13.40% <48.14%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
x/interchainstaking/keeper/abci.go	35.18% <48.14%> (-7.04%)	⬇️

[joe-bowman]

lgtm