What does shell: /bin/bash -e {0} mean in bash shell output from a github action worker?

Because git commits exit with non-zero code when there are no changes to be committed, this causes the github action to fail. To overcome that I try to check if there are any changes before committing like the following -

if git diff-index --quiet HEAD --; then
    echo "changes_exist=true" >> $GITHUB_ENV
else
    echo "changes_exist=false" >> $GITHUB_ENV
fi

GitHub then shows this to me below it - shell: /bin/bash -e {0}

Googling this does not seem to yield anything. Any idea what that means?

Exact output of the runner -

Run if git diff-index --quiet HEAD --; then
  if git diff-index --quiet HEAD --; then
      echo "changes_exist=true" >> $GITHUB_ENV
  else
      echo "changes_exist=false" >> $GITHUB_ENV
  fi
  shell: /bin/bash -e {0}
  env:
    pythonLocation: /opt/hostedtoolcache/Python/3.9.1/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.9.1/x64/lib