Exclude photos on carddav sync

[alby87 at inwind.it]

Hi people,
my experience in Kolab is going all well, this software is truly phenomenal, thank you!
I'm having a little problem: I need to store high-resolution photos on the address book, and I have made the changes in the config files. Now I have some big files that Android, backed with davdroid app, can't sync. It's possible to deactivate the photo on carddav sync? Just send the whole VCARD without any photo field.
Thank you :)
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