chore(Pane): Fix select_pane typing

Author: tony

libtmux/pane.py

@@ -285,7 +285,10 @@ def select_pane(self) -> "Pane":
         -------
         :class:`pane`
         """
-        return self.window.select_pane(self.get("pane_id"))
+        pane = self.window.select_pane(self._pane_id)
+        if pane is None:
+            raise exc.LibTmuxException(f"Pane not found: {self}")
+        return pane
 
     def __repr__(self) -> str:
         return "{}({} {})".format(