empty sparklines

src/textual/demo/widgets.py

@@ -367,7 +367,7 @@ def loop_first_last(values: Iterable[T]) -> Iterable[tuple[bool, bool, T]]:
     def update_log(self) -> None:
         """Update the Log with new content."""
         log = self.query_one(Log)
-        if not self.app.screen.can_view_partial(log) and not log.is_in_maximized_view:
+        if not self.app.screen.can_view_entire(log) and not log.is_in_maximized_view:
             return
         self.log_count += 1
         line_no = self.log_count % len(self.TEXT)
@@ -378,7 +378,7 @@ def loop_first_last(values: Iterable[T]) -> Iterable[tuple[bool, bool, T]]:
         """Update the Rich Log with content."""
         rich_log = self.query_one(RichLog)
         if (
-            not self.app.screen.can_view_partial(rich_log)
+            not self.app.screen.can_view_entire(rich_log)
             and not rich_log.is_in_maximized_view
         ):
             return

src/textual/widgets/_sparkline.py

@@ -87,8 +87,9 @@ class Sparkline(Widget):
 
     def render(self) -> RenderResult:
         """Renders the sparkline when there is data available."""
-        if not self.data:
-            return "<empty sparkline>"
+        data = self.data or []
+        if not data:
+            return ""
         _, base = self.background_colors
         min_color = base + (
             self.get_component_styles("sparkline--min-color").color
@@ -101,7 +102,7 @@ class Sparkline(Widget):
             else self.max_color
         )
         return SparklineRenderable(
-            self.data,
+            data,
             width=self.size.width,
             min_color=min_color.rich_color,
             max_color=max_color.rich_color,