new file mode 100644

@@ -0,0 +1 @@

+digraph mygraph {}

@@ -1122,8 +1122,8 @@ class XDotParser(DotParser):

             self.yscale = -1.0

             # FIXME: scale from points to pixels

-            self.width = xmax - xmin

-            self.height = ymax - ymin

+            self.width  = max(xmax - xmin, 1)

+            self.height = max(ymax - ymin, 1)

             self.top_graph = False