power indicator showing broken icon for wacom tablet device

[Patricio]

This is happening on my new Lenovo Thinkpad Yoga 370 laptop running Ubuntu 16.04.3.

indicator-power shows two devices: the laptop battery and the wacom tablet pen (which reports no battery but I assume this is a problem with the wacom driver).
indicator-power seems to prefer to show the wacom device battery status first, and said device shows a "forbidden" type of icon on the tray. (See screenshot).

upower -d output:

Device: /org/freedesktop/UPower/devices/line_power_AC
  native-path: AC
  power supply: yes
  updated: Mon 20 Nov 2017 06:07:24 PM -03 (1440 seconds ago)
  has history: no
  has statistics: no
  line-power
    warning-level: none
    online: yes
    icon-name: 'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/battery_BAT0
  native-path: BAT0
  vendor: LGC
  model: 01AV432
  serial: 1323
  power supply: yes
  updated: Mon 20 Nov 2017 06:29:28 PM -03 (116 seconds ago)
  has history: yes
  has statistics: yes
  battery
    present: yes
    rechargeable: yes
    state: fully-charged
    warning-level: none
    energy: 50.89 Wh
    energy-empty: 0 Wh
    energy-full: 50.94 Wh
    energy-full-design: 51 Wh
    energy-rate: 0 W
    voltage: 17.247 V
    percentage: 99%
    capacity: 99.8824%
    technology: lithium-polymer
    icon-name: 'battery-full-charged-symbolic'

Device: /org/freedesktop/UPower/devices/tablet_wacom_battery_0
  native-path: wacom_battery_0
  model: Wacom Co.,Ltd. Pen and multitouch sensor
  power supply: no
  updated: Mon 20 Nov 2017 06:30:54 PM -03 (30 seconds ago)
  has history: yes
  has statistics: yes
  tablet
    warning-level: action
    percentage: 0%
    icon-name: 'battery-caution-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply: yes
  updated: Mon 20 Nov 2017 06:07:24 PM -03 (1440 seconds ago)
  has history: no
  has statistics: no
  battery
    present: yes
    state: fully-charged
    warning-level: none
    energy: 50.89 Wh
    energy-full: 50.94 Wh
    energy-rate: 0 W
    percentage: 99%
    icon-name: 'battery-full-charged-symbolic'

Daemon:
  daemon-version: 0.99.4
  on-battery: no
  lid-is-closed: no
  lid-is-present: yes
  critical-action: PowerOff