Undefined address should not be shown

[JhChoy]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Performance issue
[ ] Feature request
[ ] Documentation issue or request
[ ] Other... Please describe:

Current behavior

At vvisp console,
The contract with undefined address is also shown.

Expected behavior

Console should not show the contract which has undefined address.

Environment

vvisp version: 1.1.0