#77 default_test_exemption ignored

[High Performance Coder]

If default_test_exemption was set to true in project attributes, then changes will be created with test_exempt=true.

When I upgraded aegis from 4.24 to 4.25.D510, the default_test_exemption attribute is ignored, and all changes are created with test_exempt=false.

This is a PITA, as whilst I do tend to do TDD, I'm not religious about it, and certainly the majority of my changesets do not have an associated test.