clam-qt crashes if you try to import a wallet that doesn't exist

[dooglus]

• run qt/clam-qt
• click 'file'
• click 'import wallet'
• type a bunch of random letters
• hit return
• clam-qt crashes

It appears to be an incorrectly handled exception:

************************
EXCEPTION: St13runtime_error       
CDB : Error 2, can't open database        
clam in Runaway exception       

clamd on the other hand deals with it correctly:

$ clamd importwallet /tmp/randomjunk
error: {"code":-1,"message":"CDB : Error 2, can't open database "}

[tryphe]

Fixed under Windows.

Reopen the issue if it happens under another platform. I just have clamd compiled on Linux at the moment.