mPDF error: IMAGE Error (https://maps.googleapis.com/maps/api/staticmap?center=Žižkova/,%20390%2001%20Tábor&zoom=14&size=650x340&markers=color:black%7CŽižkova/,%20390%2001%20Tábor): Error parsing image file - image type not recognised, and not supported by GD imagecreate