Description

Clear button on select form of Annotation icon doesn't clear the value and throws an error.

In case of Bug (otherwise remove this paragraph)

Browser Affected
(use this site: https://www.whatsmybrowser.org/ for non expert users)

• Internet Explorer
• Chrome
• Firefox
• Safari

Browser Version Affected

• Chrome v68

Steps to reproduce

• open a map
• open annotations panel from burger menu
• add a new point annotation
• edit the style of annotation
• try to clear icon select form with X button

Expected Result

• If the select form is not clearable that button should be removed

Current Result

• Nothing happens on the select form
  error in console:
  Uncaught TypeError: Cannot read property 'value' of null

Other useful information (optional):