fix issue rendering strips with missing style

CHANGELOG.md

@@ -20,6 +20,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `App.viewport_size` https://github.com/Textualize/textual/pull/6105
 - Added `Screen.size` https://github.com/Textualize/textual/pull/6105
 
+### Fixed
+
+- Fixed issue where Segments with a style of `None` aren't rendered https://github.com/Textualize/textual/pull/6109
+
 ## [6.1.0] - 2025-08-01
 
 ### Added

src/textual/strip.py

@@ -659,9 +659,12 @@ def render(self, console: Console) -> str:
             render = Style.render
             self._render_cache = "".join(
                 [
-                    render(style, text, color_system=color_system)
+                    (
+                        text
+                        if style is None
+                        else render(style, text, color_system=color_system)
+                    )
                     for text, style, _ in self._segments
-                    if style is not None
                 ]
             )
         return self._render_cache

tests/test_strip.py

@@ -1,4 +1,5 @@
 import pytest
+from rich.console import Console
 from rich.segment import Segment
 from rich.style import Style
 
@@ -196,3 +197,9 @@ def test_text():
     assert Strip([]).text == ""
     assert Strip([Segment("foo")]).text == "foo"
     assert Strip([Segment("foo"), Segment("bar")]).text == "foobar"
+
+
+def test_render_with_missing_style() -> None:
+    """Test that render with segments that omit a style still work."""
+    strip = Strip([Segment("Hello")])
+    assert strip.render(Console()) == "Hello"