Revert "(fixes #1372) fixed to catch mail send error exception on sending invitation"
Revert "(fixes #1372) fixed to catch mail send error exception on sending invitation"

This reverts commit 2c0e95dc7743ef515e4fccc92e4492588c0344d9.

nise-nabe/ppcon-sns,ShinichiU/OpenPNE3,nise-nabe/ppcon-sns,upsilon/travis-test,C-nakajima/OpenPNE3,kashiwasan/symfony-advanced,isaosano/OpenPNE3,openpne/OpenPNE3,ShinichiU/OpenPNE3,nishizoe/OpenPNE3,ShinichiU/OpenPNE3,ShinichiU/OpenPNE3,isaosano/OpenPNE3,ShinichiU/AuthFramework,isaosano/OpenPNE3,C-nakajima/OpenPNE3,isaosano/OpenPNE3,tejima/OP3PKG,openpne/OpenPNE3,openpne/OpenPNE3,openpne/OpenPNE3,nishizoe/OpenPNE3,ShinichiU/AuthFramework,upsilon/travis-test,ShinichiU/AuthFramework,kashiwasan/symfony-advanced,C-nakajima/OpenPNE3,C-nakajima/OpenPNE3,tejima/OP3PKG