mrocklin / dask / 2393

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Avoid importing skimage on AttributeError

When running Python in optimized mode it strips docstrings.
This causes and error in Pillow:

    dask/array/image.py:7: in <module>
	from skimage.io import imread as sk_imread
    ../../../miniconda/envs/test-environment/lib/python2.7/site-packages/skimage/io/__init__.py:7: in <module>
	from .manage_plugins import *
    ../../../miniconda/envs/test-environment/lib/python2.7/site-packages/skimage/io/manage_plugins.py:28: in <module>
	from .collection import imread_collection_wrapper
    ../../../miniconda/envs/test-environment/lib/python2.7/site-packages/skimage/io/collection.py:12: in <module>
	from PIL import Image
    ../../../miniconda/envs/test-environment/lib/python2.7/site-packages/PIL/__init__.py:27: in <module>
	__doc__ = __doc__.format(__version__)  # include version in docstring
    E   AttributeError: 'NoneType' object has no attribute 'format'

We now gracefully avoid this import

1 of 1 new or added line in 1 file covered. (100.0%)

15937 of 17390 relevant lines covered (91.64%)

0.92 hits per line