Evas textblock: Fix seg with empty textblocks that cause wrapping.
Evas textblock: Fix seg with empty textblocks that cause wrapping.

Revert "evas: don't assume anymore that text_node is != NULL."
This reverts commit 59231

Thanks to cedric for the report + initial fix.

git-svn-id: 6d771e449150288cc513807b7f4d2af31e9482bd@59237 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

TizenChameleon/uifw-evas,TizenChameleon/evas,TizenChameleon/uifw-evas,TizenChameleon/evas,TizenChameleon/evas,TizenChameleon/uifw-evas,TizenChameleon/evas,TizenChameleon/uifw-evas