Change the way invalid ProTxes are handled in `addUnchecked` and `existsProviderTxConflict` (#2691)
Change the way invalid ProTxes are handled in `addUnchecked` and `existsProviderTxConflict` (#2691)

* Invalid ProTxes should never reach addUnchecked

* Invalid ProTxes should not cause existsProviderTxConflict to crash

ionomy/ion,dashpay/dash,ionomy/ion,UdjinM6/dash,nmarley/dash,thelazier/dash,ionomy/ion,UdjinM6/dash,thelazier/dash,UdjinM6/dash,nmarley/dash,ionomy/ion,UdjinM6/dash,dashpay/dash,thelazier/dash,thelazier/dash,nmarley/dash,UdjinM6/dash,nmarley/dash,ionomy/ion,dashpay/dash,dashpay/dash,ionomy/ion,nmarley/dash,nmarley/dash,dashpay/dash,nmarley/dash,thelazier/dash