patch for non-latin character error output

[moo.tinys@…]

graphviz/graphviz.py

@@ -16 +16 @@
 __version__   = '0.6.9'
 
 
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from StringIO import StringIO
 import sha
 import os
 import sys
@@ -401 +398 @@
         if input:
             p_in.write(input)
         p_in.close()
-        out = p_out.read()
-        err = p_err.read()
+        out = p_out.read().decode('utf-8')
+        err = p_err.read().decode('utf-8')
         return out, err

cannot convert to ascii before this patch when there is an error output from graphviz with non-latin characters