e - fix using an invalid icon theme - fall back to hicolor if not exists
e - fix using an invalid icon theme - fall back to hicolor if not exists

this should fix D2036 on the e side by checking validity of an icon
theme once efreet has finished scanning for stuff and if its invalid,
going back to hicolor.

@fix

rvandegrift/e,rvandegrift/e,rvandegrift/e