fixed empty array type to float32 instead of default

    labels_list = []

    if labels is None:

      for i in range(images.shape[0]):

        labels_list.append(label_prefix+str(i))

        labels_list.append(label_prefix+str(i+1))

    else:

      labels_list = labels

    print(labels_list)

    ijtags = imagej_metadata_tags({'Labels':labels_list}, '<')

    with tifffile.TiffWriter(path, bigtiff=False,imagej=True) as tif:

      for i in range(images.shape[0]):

        print(images[i].shape)

        tif.save(images[i], metadata={'version':'1.11a','loop': False}, extratags=ijtags)

# Testing

  NX = 512

  NY = 512

  images = np.empty((NT,NY,NX))

  images = np.empty((NT,NY,NX),np.float32)

  import time

  print(str(time.time())+": Generating test images")