metrics: diff: don't print "No changes" #3576
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Makes it easier to use in shell scripts. E.g. `-z $(dvc metrics diff)`, which has the same semantics as `git diff`. Also syncs up with the behaviour of `dvc diff`. Fixes iterative#3469
efiop
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Makes it easier to use in shell scripts. E.g.
-z $(dvc metrics diff), whichhas the same semantics as
git diff. Also syncs up with the behaviourof
dvc diff.Fixes #3469
❗ I have followed the Contributing to DVC checklist.
📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here. If the CLI API is changed, I have updated tab completion scripts.
❌ I will check DeepSource, CodeClimate, and other sanity checks below. (We consider them recommendatory and don't expect everything to be addressed. Please fix things that actually improve code or fix bugs.)
Thank you for the contribution - we'll try to review it as soon as possible. 🙏