UdjinM6

Results 2 issues of UdjinM6

Tested similar patch as a part of unomp https://github.com/UNOMP/node-merged-pool/pull/17, so I _think_ this one should work fine too. At least there should be no difference between the two when comparing...

Technically, it's not possible to compile without assertions at the moment because of [this check](https://github.com/bitcoin/bitcoin/blob/master/src/util/check.h#L34-L36). However, if it would be removed one day then `txpackage_tests` will start to fail for...