[FIX] res.partners small and medium images has no default value
[FIX] res.partners small and medium images has no default value

MarkusTeufelberger/openobject-server,ovnicraft/openerp-server,gisce/openobject-server,splbio/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,ovnicraft/openerp-server,gisce/openobject-server,splbio/openobject-server,gisce/openobject-server,splbio/openobject-server