overwrite min txs in block if 0

[codchen]

Describe your changes and provide context

Testing performed to validate your change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.86%. Comparing base (7160581) to head (710efc4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #560   +/-   ##
=======================================
  Coverage   54.86%   54.86%           
=======================================
  Files         631      631           
  Lines       54951    54956    +5     
=======================================
+ Hits        30149    30152    +3     
- Misses      22645    22646    +1     
- Partials     2157     2158    +1     

Files with missing lines	Coverage Δ
baseapp/baseapp.go	65.89% <100.00%> (+0.23%)	⬆️

... and 2 files with indirect coverage changes