preview fails with: missing 1 required positional argument: 'imagery_offset'

[jreiberkyle]

I am running label-maker version 0.3.1.

When I run label-maker preview -n 3, the following error is thrown:

Traceback (most recent call last):
  File "/opt/conda/bin/label-maker", line 11, in <module>
    sys.exit(cli())
  File "/opt/conda/lib/python3.6/site-packages/label_maker/main.py", line 87, in cli
    preview(dest_folder=dest_folder, number=number, **config)
TypeError: preview() missing 1 required positional argument: 'imagery_offset'

I don't see anything in the README or the cli help mentioning imagery_offset in regard to the preview command.

Some initial digging shows that preview() does require imagery_offset as a positional argument. I'm not sure why that isn't being populated.

[drewbo]

It's supposed to be optional (for offsetting GeoTIFFs) but I forgot to give a default value for the preview function (correct in `images).