Template: Checking empty json object/array

Hi there,
I would like to parse my JSON data coming in via MQTT. I want to do this with a value_template.
But sometimes the JSON object contains something, but sometimes it is empty. How can I check if a JSON Object and/or a JSON Array is not empty?
Currently, unfortunately, I still get the following error, so I would like to fix that with this:
Error parsing value: dict object has no element 0

I hope you can help me and understand my ugly english

Thanks,
Dominic

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