Error when issuing command with no island

[robert-beckley]

Description
A clear and concise description of what the bug is.
Tried to tab "/is ban"

Steps to reproduce the behavior:

1. Have no island
2. Issue /is ban
3. Press tab
4. Error

Expected behavior
A clear and concise description of what you expected to happen.

Notify user they do not have an island so can not issue command

Screenshots
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Server Information:

[Please complete the following information:]

• Database being used : Flatfile
• OS: CentOS
• Java Version:
• BentoBox version: 0.14.1
• Addons installed?
• Other plugins?
  
  

Additional context
Add any other context about the problem here.

https://pastebin.com/y1LqHcWL

[tastybento]

Thanks!

The issue exists in unban, untrust, and uncoop too. Fixed.