Bug: some controls are disabled, some are not

## Steps to reproduce

1) Switched account in MetaMask from my own to the DroneAdmin
2) Refreshed the page

## Result
<img width="861" alt="screen shot 2018-10-26 at 09 03 02" src="https://user-images.githubusercontent.com/1623033/47550026-2e025e00-d8fe-11e8-8993-887a3bac38aa.png">
