Acha Bill

Currently, I'm counting only on `quickSetSolid`. Should we call `TransactionValidator#checkSolidity` before proceeding?

> We also found out that this error can - more or less - be reproduced by simply restarting either my node or TeeVeeEss' IRI. The OTHER node will get...

Ok @TeeVeeEss . Thanks for confirming that this is still an issue