Handle files missing extended_depth_of_field_bool about wsidicom

[erikogabrielsson]

Thank you @manthey for testing and finding this bug. The extended depth of field attribute is a required attribute in the WSI standard, but of coarse we should handle if it is not set (and then assume extended depth of field is not present). I have changed so that the default load value if the attribute is not present in the dataset is False, and changed the unit test to also test loading the Image metadata if the extended depth of field attribute is missing.

[erikogabrielsson]

Also, metadata errors should not prevent the normal loading of the wsi. The load has now been moved from the Pyramid__init__() to a cached property.

[erikogabrielsson]

Fixed in 0.18.2

[manthey]

Awesome. Thank you.