no need to call hasConversion() before getConversion() because it does mostly the same thing and waste of time. use try ... except KeyError instead.
_makeDisplayPhoto returns converted data to make it possible to use it immediately.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28369 20353a03-c40f-0410-a6d1-a30d3c3de9de