only set bat alias when the binary is present

[unixorn]

Description

only set bat alias when the binary is present

Rights

• This repository is covered by the Apache 2.0 license (except where noted in individual scripts' source), and I agree that this PR contribution is also subject to the Apache 2.0 license.

Types of changes

• Adding or updating utility script(s)
• Add/update function in jpb.plugin.zsh
• Adding link(s) to external resources
• Breaking change (fix or feature that would cause existing functionality to change)
• Bug fix (non-breaking change which fixes an issue)
• Documentation Changes
• Test updates

Checklist

General

• All new and existing tests passed.
• I have added tests to cover my changes.
• My change requires a change to the documentation.
• I have updated Readme.md to give credit to the script author
• I have updated Readme.md to describe what the script does
• If a new script is not using an Apache 2.0 license, there's a link in the script source saying what license it is under.

Scripts

• I have run pylint on all python files touched in my branch.
• I have run rubocop on all ruby files touched in my branch.
• I have run shellcheck on all shell scripts touched in my branch.
• All scripts touched/added in this PR have valid shebang lines and are marked executable.
• Any scripts added in my PR do not include language extensions in their names - no foo.sh, foo.rb or foo.py. We do not want to have to change other scripts just because something gets rewritten in a better fitting language.

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ COPYPASTE	jscpd	yes		no	0.85s
✅ REPOSITORY	devskim	yes		no	2.06s
✅ REPOSITORY	dustilock	yes		no	0.01s
✅ REPOSITORY	gitleaks	yes		no	0.28s
✅ REPOSITORY	git_diff	yes		no	0.02s
⚠️ REPOSITORY	kics	yes		1	1.43s
✅ REPOSITORY	secretlint	yes		no	1.03s
✅ REPOSITORY	syft	yes		no	0.3s
✅ REPOSITORY	trivy-sbom	yes		no	1.19s
✅ REPOSITORY	trufflehog	yes		no	5.36s

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