Reduce fatal exception to a warning for 'eval'
Reduce fatal exception to a warning for 'eval'

If the data xml contains an eval expression that does not compute,
the convert procedure would throw an exception all the way up. Now,
catch that and only display a warning.

Hopefully, this warning will be fixed to contain more useful info
about its nature.

splbio/openobject-server,gisce/openobject-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,vnc-biz/openerp-server,vnc-biz/openerp-server,MarkusTeufelberger/openobject-server,ovnicraft/openerp-server,xrg/openerp-server,splbio/openobject-server,ovnicraft/openerp-server,gisce/openobject-server,xrg/openerp-server