"undefined.svg" or generic fallback if provider has no data

[majorsl]

Describe the bug
Rarely, but on occasion I've seen my provider return an "undefined" for a condition icon. This results in the card displaying a broken image.

To Reproduce
Steps to reproduce the behavior:
Just wait for a provider to provide an unknown or undefined condition.

Expected behavior
If possible, the card should have some logic to fallback to a generic icon in the event a provider is missing something. I've seen other cards use an "undefined.svg" for this situation.

Desktop (please complete the following information):

• 2.4.7
• HA Docker 2024.7.1
• OS: Docker
• Edge/Chrome
• 126.0

[Eisbaer2]

Same here

[MHerbst]

I have got the same problem in combination with the DWD weather integration that does not provide a value for the current day.
In this case the card tries to load this icon: https://cdn.jsdelivr.net/gh/mlamberts78/weather-chart-card/dist/icons/undefined.svg that does not exist.