Notification 'Omit is undefined...' Warning

[rhursig]

When using the notification.yaml as a blueprint in Home Assistant, the following warning is generated when various variables are left blank. In my application, the Image URL (image_url) was left blank, but the resulting notification popup on Android TV had an oversized window as if the image should be there. Other variables/functionality seems to be impacted by this issue as well due to shared syntax: image_url, mdi_icon, sound_url, and sound_volume_percent.

I have a verified solution below that corrects the issue in my environment. Thank you so much for your development of this!

Log transcript:

Log details (WARNING)

Logger: homeassistant.helpers.template
Source: helpers/template/init.py:1750
First occurred: 21:30:24 (1 occurrence)
Last logged: 21:30:24
Template variable warning: 'omit' is undefined when rendering '{{ _ev.image_url if _ev.get('image_url') else omit }}'

User-Verified Fix (your mileage may vary):

Change all 8 instances of else omit to else '''' over lines 377 through 398 of notification.yaml. Users who installed this blueprint can find the file at config\blueprints\script\Trooped\notification.yaml.

User Environment Details:

• Home Assistant:

  • Installation method: Home Assistant OS
  • Core: 2025.12.5
  • Supervisor: 2025.12.3
  • Operating: System 16.3
  • Frontend: 20251203.3

• Android TV:

  • Device: Google TV Streamer
  • System Firmware: UTTK.250729.004
  • Cast Firmware: 3.72.446070