Don't append the preparation method string if we get an empty string, note that it's possible to have a "<IPrp></IPrp>" string in an mx2 file.
Don't append the preparation method string if we get an empty string, note that
it's possible to have a "<IPrp></IPrp>" string in an mx2 file.

svn path=/trunk/extragear/utils/krecipes/; revision=1039346

eliovir/krecipes,eliovir/krecipes,eliovir/krecipes,eliovir/krecipes