Fix bug lp:1193779; Pull flows do not create procurement internal moves.
[FIX] procurement: add condition check_move for transition confirm_mto->ready in procurement workflow

When no other module is installed, no change of behaviour (check_move returns None, always True)
When stock_location is installed, depending of the order of evaluation of the conditions, could go to ready without passing by move activity, avoid this
Courtesy of Mohammad Alhashash