Cleanup and new test.

src/textual/css/_style_properties.py

@@ -912,7 +912,7 @@ class StyleFlagsProperty:
                     )
             try:
                 style = Style.parse(style_flags)
-            except rich.errors.StyleSyntaxError as exc:
+            except rich.errors.StyleSyntaxError as error:
                 if "none" in words and len(words) > 1:
                     raise StyleValueError(
                         "cannot mix 'none' with other style flags",
@@ -920,7 +920,7 @@ class StyleFlagsProperty:
                             self.name, " ".join(words), context="inline"
                         ),
                     ) from None
-                raise exc from None
+                raise error from None
             if obj.set_rule(self.name, style):
                 obj.refresh()
 

tests/test_style_properties.py

@@ -18,5 +18,15 @@ def test_text_style_none_with_others(style_attr):
     """Style "none" mixed with others should give custom Textual exception."""
     styles = Styles()
 
-    with pytest.raises(StyleValueError) as exc_info:
+    with pytest.raises(StyleValueError):
         setattr(styles, style_attr, "bold none underline italic")
+
+
+@pytest.mark.parametrize("style_attr", ["text_style", "link_style"])
+def test_text_style_set_to_none(style_attr):
+    """Setting text style to "none" should clear the styles."""
+    styles = Styles()
+    setattr(styles, style_attr, "bold underline italic")
+    assert getattr(styles, style_attr) != Style.null()
+    setattr(styles, style_attr, "none")
+    assert getattr(styles, style_attr) == Style.null()