Exception handling of transactions

[joshniemela]

I cannot seem to be able to get the acutal cause of an exception with client/with-transaction. For instance if I have a constraint in the graph preventing me from finishing the transaction, then it only returns "Can't commit, transaction has been rolled back". Expected behaviour would be that the exception also includes "Node already exists..." as a cause of the exception.

[jacobemcken]

Thanks, we'll look into it.