Merge pull request matplotlib#30321 from nrnavaneet/feature-branch

Fix type annotation for Axes.get_legend() to include None

Author: timhoffm

lib/matplotlib/axes/_base.pyi

@@ -225,7 +225,7 @@ class _AxesBase(martist.Artist):
         ymin: float | None = ...,
         ymax: float | None = ...
     ) -> tuple[float, float, float, float]: ...
-    def get_legend(self) -> Legend: ...
+    def get_legend(self) -> Legend | None: ...
     def get_images(self) -> list[AxesImage]: ...
     def get_lines(self) -> list[Line2D]: ...
     def get_xaxis(self) -> XAxis: ...