How to handle JMESPath contains filter on attribute that may be null?

Context

UserJohnCDeveloper wants to run a JMESPath filter on attributes that may be null
how to daisy chain or pipe with the Azure az command --query clause

Jmespath support for pipe expressions
Jmespath supports passing the result of one expression to another, though use of pipe expressions. This enables queries of arbitrary complexity through chaining together of multiple sub-expressions and filters.

 --query "[? publisherName!='null']|[? contains(publisherName,'ACME')]" --all

shell azure null filtering jmespath

For those looking for a more general approach, use || to create an or-expression:

expression || expression