Fix image maps in inheritance diagrams.

mdboom · mdboom · commit 6590f0f6779a · 2008-07-31T19:05:30.000Z
svn path=/trunk/matplotlib/; revision=5940
diff --git a/doc/sphinxext/inheritance_diagram.py b/doc/sphinxext/inheritance_diagram.py
@@ -326,10 +326,10 @@ def html_output_graph(self, node):
     # Create a mapping from fully-qualified class names to URLs.
     urls = {}
     for child in node:
-        if 'refuri' in child:
-            urls[child['reftitle']] = child['refuri']
-        elif 'refid' in child:
-            urls[child['reftitle']] = '#' + child['refid']
+        if child.get('refuri') is not None:
+            urls[child['reftitle']] = child.get('refuri')
+        elif child.get('refid') is not None:
+            urls[child['reftitle']] = '#' + child.get('refid')
 
     # These arguments to dot will save a PNG file to disk and write
     # an HTML image map to stdout.
