Clicking on Specifications tab with no asset data throws exception

Description

If starting a system with model initializers disabled, clicking on the device specifications tab results in an exception (as reported by https://groups.google.com/forum/?hl=en#!topic/sitewhere/r3BtN-mIpDQ)

Environment

None

Assignee

DerekA

Reporter

DerekA

Labels

None

Components

Fix versions

Priority

Major
Configure