Fix for avatar image not being saved in disk cache on GTK version #576
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Symptom
Avatar icon in the desktop notification (libnotify) of GTK version was missing.
Cause
Save to disk operation was aborted due to an exception in the
get_prefsfunction on agent.py, as it was trying to fetch a non-existing element
(proxy_type) from config.settings dictionary.
Solution
Check if the key exists in the dictrionary before using it, and return an empty
string if not.