[FIX] incorrect return value for fix_view_modes in case the view_type is tree
[FIX] incorrect return value for fix_view_modes in case the view_type is tree

havt/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web,akretion/openerp-web