Tidy up some empty yields

src/textual/_compositor.py

@@ -158,8 +158,7 @@ class ChopsUpdate:
                 yield new_line
 
     def __rich_repr__(self) -> rich.repr.Result:
-        return
-        yield
+        yield from ()
 
 
 @rich.repr.auto(angular=True)

src/textual/_parser.py

@@ -155,8 +155,7 @@ class Parser(Generic[T]):
                 yield popleft()
 
     def parse(self, on_token: Callable[[T], None]) -> Generator[Awaitable, str, None]:
-        return
-        yield
+        yield from ()
 
 
 if __name__ == "__main__":

src/textual/app.py

@@ -383,8 +383,7 @@ class App(Generic[ReturnType], DOMNode):
 
     def compose(self) -> ComposeResult:
         """Yield child widgets for a container."""
-        return
-        yield
+        yield from ()
 
     def get_css_variables(self) -> dict[str, str]:
         """Get a mapping of variables used to pre-populate CSS.

src/textual/events.py

@@ -23,8 +23,7 @@ class Event(Message):
     """The base class for all events."""
 
     def __rich_repr__(self) -> rich.repr.Result:
-        return
-        yield
+        yield from ()
 
 
 @rich.repr.auto

src/textual/widget.py

@@ -401,8 +401,7 @@ class Widget(DOMNode):
             ```
 
         """
-        return
-        yield
+        yield from ()
 
     def _post_register(self, app: App) -> None:
         """Called when the instance is registered.