Fix for empty ListView bindings not firing (#2281)

* Fix bindings not firing when ListView is empty

* Regression test for empty ListView bindings not working

* Update changelog

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
-### Changed
+### Changed
 
 - Changed signature of Driver. Technically a breaking change, but unlikely to affect anyone.
 - Breaking change: Timer.start is now private, and returns No
@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 
 - Fixed order styles are applied in DataTable - allows combining of renderable styles and component classes https://github.com/Textualize/textual/pull/2272
+- Fix empty ListView preventing bindings from firing https://github.com/Textualize/textual/pull/2281
 
 
 ## [0.19.1] - 2023-04-10

src/textual/app.py

@@ -2149,7 +2149,7 @@ class App(Generic[ReturnType], DOMNode):
             action_target = getattr(self, destination)
             implicit_destination = True
         else:
-            action_target = default_namespace or self
+            action_target = default_namespace if default_namespace is not None else self
             action_name = target
 
         handled = await self._dispatch_action(action_target, action_name, params)

tests/listview/test_inherit_listview.py

@@ -1,19 +1,26 @@
 from textual.app import App, ComposeResult
+from textual.binding import Binding
 from textual.widgets import Label, ListItem, ListView
 
 
 class MyListView(ListView):
     """Test child class of a ListView."""
 
+    BINDINGS = [Binding(key="s", action="set", description="Set")]
+
     def __init__(self, items: int = 0) -> None:
         super().__init__()
         self._items = items
+        self.action_fired = False
 
     def compose(self) -> ComposeResult:
         """Compose the child widgets."""
         for n in range(self._items):
             yield ListItem(Label(f"This is item {n}"))
 
+    def action_set(self) -> None:
+        self.action_fired = True
+
 
 class ListViewApp(App[None]):
     """ListView test app."""
@@ -43,3 +50,11 @@ async def test_populated_inherited_list_view() -> None:
         assert pilot.app.query_one(MyListView).index == 0
         await pilot.press("down")
         assert pilot.app.query_one(MyListView).index == 1
+
+
+async def test_actions_work_when_list_view_empty() -> None:
+    """Regression test for https://github.com/Textualize/textual/issues/2265"""
+    async with ListViewApp().run_test() as pilot:
+        await pilot.press("tab", "s")
+        list_view = pilot.app.query_one(MyListView)
+        assert list_view.action_fired