fix QuadMesh get_cursor_data if no array is set

Author: raphaelquast

lib/matplotlib/collections.py

@@ -2218,6 +2218,7 @@ def get_cursor_data(self, event):
         contained, info = self.contains(event)
         if len(info["ind"]) == 1:
             ind, = info["ind"]
-            return self.get_array()[ind]
+            array = self.get_array()
+            return self.get_array()[ind] if array else None
         else:
             return None