[evolution-patches] fix for #314942 (camel-groupwise)

[Vivek Jain <jvivek novell com>]

hi,

I have attached the patch at:
http://bugzilla.gnome.org/show_bug.cgi?id=314942

We sometimes ended up freeing the uninitialized variables, e.g. when
there was no "from" in an email. 

Thanks,
Vivek Jain