[live] Restore sys.stderr when an exception happens during a refresh

Without this the user sees no error displayed in their terminal - and even capturing the exception and displayed their own error reporting is ineffective.

rich/live.py

@@ -118,7 +118,15 @@ def start(self, refresh: bool = False) -> None:
             self._enable_redirect_io()
             self.console.push_render_hook(self)
             if refresh:
-                self.refresh()
+                try:
+                    self.refresh()
+                except Exception:
+                    # If refresh fails, we want to stop the redirection of sys.stderr,
+                    # so the error stacktrace is properly displayed in the terminal.
+                    # (or, if the code that calls Rich captures the exception and wants to display something,
+                    # let this be displayed in the terminal).
+                    self.stop()
+                    raise
             if self.auto_refresh:
                 self._refresh_thread = _RefreshThread(self, self.refresh_per_second)
                 self._refresh_thread.start()
@@ -210,7 +218,10 @@ def update(self, renderable: RenderableType, *, refresh: bool = False) -> None:
     def refresh(self) -> None:
         """Update the display of the Live Render."""
         with self._lock:
-            self._live_render.set_renderable(self.renderable)
+            try:
+                self._live_render.set_renderable(self.renderable)
+            except Exception as e:
+                t = 2
             if self.console.is_jupyter:  # pragma: no cover
                 try:
                     from IPython.display import display