我有一些基于搜索查询过滤数组的代码。这很好，但是如果没有匹配到任何一个过滤器，我想运行一个函数。
过滤代码：

function filter() {
    let filters = "";
    let checkboxDiv = document.getElementById("checkboxes");
    let inputs = checkboxDiv.getElementsByTagName("input");

    let postcode = document.getElementById("postcodeInput").value;
    let suburb = document.getElementById("suburbInput").value;
    suburb = suburb.charAt(0).toUpperCase() + suburb.slice(1);
    let capacity = document.getElementById("capacityInput").value;
    let results = Object.keys(halls);

    results.filter(key => {
        if (postcode == halls[key]['Location'][3]['Postcode'] && suburb == "") {filters += "Postcode "; return true;}
        if (suburb == halls[key]['Location'][1]['Suburb'] && postcode == "") {filters += "Suburb "; return true;};
        if (capacity <= halls[key]['Room'][0]['Standing Capacity'] && capacity != "") {filters += "Capacity ";return true;}
        return false
    }).forEach(key => filterAll([halls[key]]));
}

如果filter语句返回false并运行函数，我如何“捕获”它？
在英语中：如果用户输入一个郊区，并且没有与之匹配的郊区，则运行该函数。
提前感谢：）