[news.eclipse.tools] How can I pre-req an Optional plugin?

["Randy Hudson" <none@xxxxxxx>]

How can I have Plugin B pre-req Plugin A, but also no care if Plugin A is
not installed.  For example, we are trying to dynamically find a class by
using Class.forName("foo") to see if a class from Plugin A is around.  If it
is, great, and we will then instantiate that class foo.  If not, we don't
care.

Currently Plugin B is getting deactiviated if Plugin A is not found.