Misleading error message when adding market order with invalid denomination

[haasted]

Using the cli to add a a market order with a non-existant denomination results in the rather unhelpful error response "Internal".

How to reproduce

1. Start a local testnet.
2. Add a new market order:
   ./build/emcli tx market add-limit 1ungmn 500bobs orderid1 --from <address>

The non-existant denomination "bobs" will make the tx fail. The output from the cli is:

codespace: market
code: 1
data: ""
rawlog: internal
logs: []
info: ""
gaswanted: 200000
gasused: 62176
tx: null
timestamp: ""

Expected behavior
The log should contain an error message informing of the erroneous denomination.