return an empty array from backend

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You will need to add some console.log() debug statements to better understand what’s happening.

I would suggest that it’s better to see if you have results by checking the length of the returned items:

Instead of this:

.then((results) => {
   let rowParam = results.items[0];

If there are no items, you will end up with an undefined runtime error.

You want something like this (not tested):

.then((results) => {
    if(results.items.length > 0) {
        // do stuff with the results
        let rowParam = results.items[0];
        return{
            "total": rowParam.cout,
            "period": rowParam.period
        };
    }
    else {
       return{
            "total": 0,
            "period": []
        };
    }