When there are no votes I want "no votes" to show up in the datatable. Right now 'undefined' is showing up.
The condition will work, in your case, if opinion will be absent
like this https://snippet.webix.com/46s55hc4
But you have opinion, so you just need to add votes in the condition(so it will check the votes in data) like obj.opinion.votes === undefined
Please check https://snippet.webix.com/4i4ma8xk
obj.opinion.votes === undefined
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