Fixing an issue when invoking swagger from the web browser

Change-Id: Icaa0391d1af4ab233d6d01bc23c80d31a20149e3
diff --git a/main.py b/main.py
index d394c4e..bb82ed5 100755
--- a/main.py
+++ b/main.py
@@ -48,7 +48,7 @@
                                          get_my_primary_local_ipv4()),
     rest_port=os.environ.get('REST_PORT', 8881),
     work_dir=os.environ.get('WORK_DIR', '/tmp/chameleon'),
-    swagger_url=os.environ.get('SWAGGER_URL', '/'),
+    swagger_url=os.environ.get('SWAGGER_URL', ''),
 )