handle any implicit None return in user Python callback
handle any implicit None return in user Python callback

wtfbbqhax/libdnet,kbandla/libdnet,jncornett/libdnet,jncornett/libdnet,wtfbbqhax/libdnet,kbandla/libdnet,jncornett/libdnet,wtfbbqhax/libdnet,kbandla/libdnet