Ensure MINIMALDATA invalid tests can only fail one way
Ensure MINIMALDATA invalid tests can only fail one way

Removes the need for the 'negated' versions of the tests, and ensures
other failures don't mask what we're trying to test.

(cherry picked from commit 554147ad9e6fee1c1d3827ca971647a97a5c0d66)

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin