message: minifix: hide drive selector hyphen when no size info
  We hide the separator hyphen between the name and size when there is no
  size information available, in the drive selector modal.
  Change-Type: patch
  Changelog-Entry: Hide the drive-selector separator hyphen when no drive
  size is available.
diff: tabindex="{{ 15 + $index }}"
  ng-keypress="modal.keyboardToggleDrive(drive, $event)">
  - <h4 class="list-group-item-heading">{{ drive.description }} -
  + <h4 class="list-group-item-heading">{{ drive.description }}
  <span class="word-keep"
  - ng-show="drive.size">{{ drive.size | closestUnit }}</span>
  + ng-show="drive.size"> - {{ drive.size | closestUnit }}</span>
  </h4>
  <p class="list-group-item-text">{{ drive.displayName }}</p>
  