[FIX] display value '0' in numerical field, only avoid displaying value when it's actually 'false'
[FIX] display value '0' in numerical field, only avoid displaying value when it's actually 'false'

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extra : convert_revision : xmo%40openerp.com-20110520131302-ub27e9jyb0wgwpay

gisce/openerp-web,splbio/openerp-web,splbio/openerp-web,MarkusTeufelberger/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web