How to check if one of two chosen fields in the front review are emty so that it will not show the card

Anki Card Design
2

You can use a conditional field:

Normally a card would be generated if either the expression or notes field had text
in it. If you only wanted a card generated if expression was not empty, then you could
change the template to this:
{{#Expression}}
    {{Expression}}
    {{Notes}}
{{/Expression}}

For further details see Conditional Replacement.

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