When defining custom mappings, the default -> mapping gets ignored. However, later in the code we assume some mappings exist, at least _username.
We need to make sure that internal mappings (with _ prefixed) do get passed on, but that needs to happen before the other mapping rules are applied so that they can be overridden.
Metadata Update from @puiterwijk: - Custom field patch_available adjusted to on (was: 0) - Custom field sensitive reset - Issue close_status updated to: None
Fix in #248
Metadata Update from @puiterwijk: - Custom field sensitive reset
Commit 74ca9ddb fixes this issue