Handle nulls when calculating hours and minutes string

app/Helpers/TimeHelper.php

@@ -21,11 +21,11 @@ class TimeHelper
    /**
     * Display an integer as an "x hours, y minutes" English phrase.
     *
     * @param int $minutes The value to be displayed
     * @param int|null $minutes The value to be displayed
     *
     * @return string
     */
    public static function hoursAndMinutes(int $minutes)
    public static function hoursAndMinutes(?int $minutes)
    {
        if ($minutes === 0) {
            return '0 minutes';

public/js/app.js

__webpack_require__.r(__webpack_exports__);
/* WEBPACK VAR INJECTION */(function(global) {/**!
 * @fileOverview Kickass library to create and place poppers near their reference elements.
 * @version 1.14.6
 * @version 1.14.7
 * @license
 * Copyright (c) 2016 Federico Zivolo and contributors
 *
  if (getStyleComputedProperty(element, 'position') === 'fixed') {
    return true;
  }
  return isFixed(getParentNode(element));
  var parentNode = getParentNode(element);
  if (!parentNode) {
    return false;
  }
  return isFixed(parentNode);
}

/**
  var _data$offsets = data.offsets,
      popper = _data$offsets.popper,
      reference = _data$offsets.reference;
  var round = Math.round,
      floor = Math.floor;


  var isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
  var isVariation = data.placement.indexOf('-') !== -1;
  var sameWidthOddness = reference.width % 2 === popper.width % 2;
  var bothOddWidth = reference.width % 2 === 1 && popper.width % 2 === 1;
  var noRound = function noRound(v) {
    return v;
  };

  var horizontalToInteger = !shouldRound ? noRound : isVertical || isVariation || sameWidthOddness ? Math.round : Math.floor;
  var verticalToInteger = !shouldRound ? noRound : Math.round;
  var referenceWidth = round(reference.width);
  var popperWidth = round(popper.width);

  var isVertical = ['left', 'right'].indexOf(data.placement) !== -1;
  var isVariation = data.placement.indexOf('-') !== -1;
  var sameWidthParity = referenceWidth % 2 === popperWidth % 2;
  var bothOddWidth = referenceWidth % 2 === 1 && popperWidth % 2 === 1;

  var horizontalToInteger = !shouldRound ? noRound : isVertical || isVariation || sameWidthParity ? round : floor;
  var verticalToInteger = !shouldRound ? noRound : round;

  return {
    left: horizontalToInteger(bothOddWidth && !isVariation && shouldRound ? popper.left - 1 : popper.left),