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
1

So i have a card looks like this (I will give them the number for easier viewing).

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As in the picture, I leave the third field blank.
I have three types of cards (front preview - back preview)
2,5 - 1
3,5 - 1
4,5 - 1
And as in the picture, the third field is empty but it still show the other (which mean 5).
It makes my decks one more useless card and I don’t want it.
How can I fix that ?
Thank you!
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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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