Mantis "list" command

[0xbharath]

@Prateek-Thakare @Ncoder2 Can we have a "list" as a top level command for mantis along with onboard and scan? I feel that this can come in handy when one wants to list orgs that are onboarded to the Mantis and other details. I have onboarded 20+ orgs on Mantis and it is not comfortable to do a DB query or go to dashboard everytime to get this list.

Example:

$ mantis list orgs
org1 
org2
org2

[Prateek-Thakare]

Hey @0xbharath
This feature was added as part of latest commit.

[0xbharath]

Thanks. Will check it out.

[0xbharath]

This works as expected. Thank you. However, there is an unhandled exception when no orgs are onboarded. Can you add exception handling for these cases?