fix: don't overwrite with empty cmd/entrypoint

[catthehacker]

fixes #917
Signed-off-by: Ryan [email protected]

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	1.01s
✅ EDITORCONFIG	editorconfig-checker	2		0	0.7s
✅ GIT	git_diff	yes		no	0.01s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[codecov]

Codecov Report

Merging #1076 (8a09edd) into master (4f8da0a) will increase coverage by 2.48%.
The diff coverage is 83.77%.

@@            Coverage Diff             @@
##           master    #1076      +/-   ##
==========================================
+ Coverage   57.50%   59.99%   +2.48%     
==========================================
  Files          32       38       +6     
  Lines        4594     4839     +245     
==========================================
+ Hits         2642     2903     +261     
+ Misses       1729     1704      -25     
- Partials      223      232       +9     

Impacted Files	Coverage Δ
pkg/model/action.go	0.00% <ø> (ø)
pkg/model/planner.go	50.73% <ø> (+0.32%)	⬆️
pkg/container/docker_run.go	4.88% <5.00%> (-0.66%)	⬇️
pkg/runner/logger.go	66.00% <67.56%> (+0.56%)	⬆️
pkg/runner/runner.go	72.80% <71.69%> (-3.67%)	⬇️
pkg/exprparser/interpreter.go	74.57% <75.00%> (+1.17%)	⬆️
pkg/runner/expression.go	91.02% <78.26%> (+0.20%)	⬆️
pkg/runner/step.go	80.76% <80.76%> (ø)
pkg/runner/run_context.go	78.84% <82.50%> (-0.81%)	⬇️
pkg/runner/action.go	83.46% <83.46%> (ø)
... and 16 more

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