validateArgs = (triggers, triggerMap) => {
    validateTriggerPresence(triggers)
    if (!triggerMap) return true
    for (const id in triggerMap) validateModalPresence(id)
    return true
  }
Checks if triggers and their corresponding modals
are present in the DOM
@param  {array} triggers   Array of DOM nodes which have data-triggers
@param  {array} triggerMap Associative array of modals and their triggers
@return {boolean}