Don't fail on empty LocalStatus cache files
Don't fail on empty LocalStatus cache files

As reported in https://github.com/spaetz/offlineimap/pull/2, we would
fail when files are empty because file.read() would throw attribute
errors.

Fix this by removing the superfluous read() check and additionally log
some warning message.

Reported-by: Ralf Schmitt
Signed-off-by: Sebastian Spaeth <98dcb2717ddae152d5b359c6ea97e4fe34a29d4c@SSpaeth.de>

frioux/offlineimap,frioux/offlineimap