Revert "Reset $this->_postData not $postData if not related to form."
Revert "Reset $this->_postData not $postData if not related to form."

This reverts commit 7dbc1a9d56293e5ee3ba8b438f86dcc810a6ebdf.

koala-framework/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,koala-framework/koala-framework