Track-pad & NDOF events were using KM_NOTHING which wasn't included in the RNA enum, causing the value to be an empty string in exported key-map (which then failed to load back). Add back 'Nothing' value, keep it last since it's not used often.
Track-pad & NDOF events were using KM_NOTHING which wasn't included in the RNA enum, causing the value to be an empty string in exported key-map (which then failed to load back). Add back 'Nothing' value, keep it last since it's not used often.