FIX: minorformatter None

Author: jklymak

lib/matplotlib/colorbar.py

@@ -1202,6 +1202,7 @@ def _reset_locator_formatter_scale(self):
         self._locator = None
         self._minorlocator = None
         self._formatter = None
+        self._minorformatter = None
         if (self.boundaries is not None or
                 isinstance(self.norm, colors.BoundaryNorm)):
             if self.spacing == 'uniform':