Comment 9 for bug 101818

This revision:
https://infrae.com/viewvc/SilvaExternalSources/trunk/CodeSource.py?r1=23215&r2=23819
has broken many of the Code Sources in the Infrae site. The problem is, many of
the older ones don't have a value, even an empty one, stored in the xml if a
field was empty.

There are probably lots of old Code Sources out there with the same non-existent
field/values.