Fix bug when trying to get distribution flag

Framework/PythonInterface/mantid/plots/mantidaxes.py

@@ -666,7 +666,8 @@ class MantidAxes(Axes):
             workspace = args[0]
             spec_num = self.get_spec_number_or_bin(workspace, kwargs)
             normalize_by_bin_width, kwargs = get_normalize_by_bin_width(workspace, self, **kwargs)
-            is_normalized = normalize_by_bin_width or workspace.isDistribution()
+            is_normalized = normalize_by_bin_width or \
+                            (hasattr(workspace, 'isDistribution') and workspace.isDistribution())
 
             with autoscale_on_update(self, autoscale_on):
                 artist = self.track_workspace_artist(workspace,
@@ -786,7 +787,8 @@ class MantidAxes(Axes):
             workspace = args[0]
             spec_num = self.get_spec_number_or_bin(workspace, kwargs)
             normalize_by_bin_width, kwargs = get_normalize_by_bin_width(workspace, self, **kwargs)
-            is_normalized = normalize_by_bin_width or workspace.isDistribution()
+            is_normalized = normalize_by_bin_width or \
+                            (hasattr(workspace, 'isDistribution') and workspace.isDistribution())
 
             with autoscale_on_update(self, autoscale_on):
                 artist = self.track_workspace_artist(workspace,

docs/source/release/v6.2.0/framework.rst

@@ -38,6 +38,10 @@ Python
     putting new features at the top of the section, followed by
     improvements, followed by bug fixes.
 
+Bugfixes
+########
+- Fix a bug (crash) in plotting MD workspaces when "Normalize to bin width" is set to False
+
 Installation
 ------------