migration to python3 (#1)

Change-Id: I964b75c1316b7711cde905c6e98ea027a8557047
Signed-off-by: peusterm <manuel.peuster@uni-paderborn.de>
diff --git a/src/emuvim/api/rest/network.py b/src/emuvim/api/rest/network.py
index e8c6b9a..a16a84a 100755
--- a/src/emuvim/api/rest/network.py
+++ b/src/emuvim/api/rest/network.py
@@ -115,7 +115,7 @@
             return str(c), 200, CORS_HEADER
         except Exception as ex:
             logging.exception("API error.")
-            return ex.message, 500, CORS_HEADER
+            return str(ex), 500, CORS_HEADER
 
 
 class DrawD3jsgraph(Resource):