[BUG] [MDS] No available datasources or illegal datasource crashes the plugin

[derek-ho]

trafficstars

What is the bug? When no datasources available, or illegal option passed in via URL the plugin crashes

How can one reproduce the bug?

• enable MDS
• navigate to the security dashboards plugin
• Pass in either non-existent datasource, or no datasources connected

What is the expected behavior?

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots? If applicable, add screenshots to help explain your problem.

Do you have any additional context? Add any other context about the problem.