Fix formatting for "Empty locale identifier" exception added in #1164 (…

…#1184)

babel/core.py

@@ -343,7 +343,7 @@ def parse(
                 f"Empty locale identifier value: {identifier!r}\n\n"
                 f"If you didn't explicitly pass an empty value to a Babel function, "
                 f"this could be caused by there being no suitable locale environment "
-                f"variables for the API you tried to use.",
+                f"variables for the API you tried to use."
             )
             if isinstance(identifier, str):
                 raise ValueError(msg)  # `parse_locale` would raise a ValueError, so let's do that here

tests/test_core.py

@@ -395,8 +395,9 @@ def test_language_alt_official_not_used():
 
 
 def test_locale_parse_empty():
-    with pytest.raises(ValueError, match="Empty"):
+    with pytest.raises(ValueError, match="Empty") as ei:
         Locale.parse("")
+    assert isinstance(ei.value.args[0], str)
     with pytest.raises(TypeError, match="Empty"):
         Locale.parse(None)
     with pytest.raises(TypeError, match="Empty"):