[FIX] openerp.tools.misc.file_open:  Very little fix to display coherent error message when file not found occurs.
[FIX] openerp.tools.misc.file_open:  Very little fix to display coherent error message when file not found occurs.

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