metrics: diff: don't print "No changes"

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 · Apr 2, 2020 · d821fa7 · d821fa7
1 parent a338fad
commit d821fa7
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/dvc/command/metrics.py b/dvc/command/metrics.py
@@ -109,7 +109,7 @@ def _show_diff(diff):
     from texttable import Texttable
 
     if not diff:
-        return "No changes."
+        return ""
 
     table = Texttable()
 

diff --git a/tests/unit/command/test_metrics.py b/tests/unit/command/test_metrics.py
@@ -64,7 +64,7 @@ def test_metrics_diff_no_diff():
 
 
 def test_metrics_diff_no_changes():
-    assert _show_diff({}) == "No changes."
+    assert _show_diff({}) == ""
 
 
 def test_metrics_diff_new_metric():