config.py IndexError in save(): list index out of range

[Cas]

Forwarded from Launchpad

​https://bugs.launchpad.net/ubuntu/+source/deluge/+bug/852454

File "/usr/lib/python2.7/dist-packages/deluge/config.py", line 409, in save
    start, end = objects[0]
IndexError: list index out of range

Not sure of exact cause but seems that if the conf file is not in json format or empty then the error will occur.

Simply adding IndexError? to the existing IOError except will catch the error instead of crashing.

except (IOError, IndexError), e:

[Cas]

Fix committed to 1.3-stable:​e336cd64