Currently, body text and html are removed from the content values to be stored as files
in the filesystem. This could lead to a IllegalArgumentException because we passed
an empty content value to the update operation. We must ensure that we update
at least one item.
Related BUGDUMP-4037330 and http://forum.cyanogenmod.org/topic/112563-massive-data-use
Change-Id: Ib9ba10eb2cb86598bef6e5f8bc11553d09fc4ef8
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>