Function checkNewContainer

src/lib/nested_property.js:224–232

* make new sub-container as needed. * returns false if there's no container and none is needed * because we're only deleting an attribute

(container, part, nextPart, toDelete)

 * because we're only deleting an attribute
 */
function checkNewContainer(container, part, nextPart, toDelete) {
    if(container[part] === undefined) {
        if(toDelete) return false;

        if(typeof nextPart === 'number') container[part] = [];
        else container[part] = {};
    }
    return true;
}

function badContainer(container, propStr, propParts) {
    return {