This may not be a bug if it's intended behavior, although I don't believe this is the case. If I'm wrong then this thread should be moved to Feature Suggestions.
I don't believe DCC Resume requests should be affected by ignoring DCC's. I'm sending a file to this person, I obviously don't want to ignore a resume request from them. Resume requests should be exempt from ignore if there is a corresponding dcc send pending.
~ Edit ~
This includes 'DCC Accept' of course.