bug fixes - loading nonexisting workout

rowers/c2stuff.py

@@ -447,8 +447,12 @@ def get_username(access_token):
 
     me_json = response.json()
 
+    try:
+        res =  me_json['data']['username']
+    except KeyError:
+        res = None
 
-    return me_json['data']['username']
+    return res
 
 # Get user id, having access token
 # Handy for checking if the API access is working