[Startup script] 'Namespace' object has no attribute 'func'

[bridgedragon]

• I have read the Contributing file of the documentation.
• I have searched the issues (including closed ones) and believe that this is not a duplicate.

Issue

When executing:
`./nodechain.py -t xxx -n xxx -p xxx -sp xxx -b "xxx"

It throws the following exception:

./nodechain.py -t eth -n infura-mainnet -p 3001 -sp 3002 -b "/dev/null" Traceback (most recent call last): File "./nodechain.py", line 564, in <module> args = argumentHandler() File "./nodechain.py", line 176, in argumentHandler args.func(args) AttributeError: 'Namespace' object has no attribute 'func'

It should be handled.