Make ImageSeries/data required #481
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The
ImageSeriesneurodata_type is a subtype ofTimeSeries.TimeSeriesrequires the dataset "data"; however,ImageSeriesmakes data optional because "external_file" may be provided in place of "data". This breaks the rules of inheritance -- a child must have all required fields of a parent, and this inconsistency creates challenges in NeurodataWithoutBorders/pynwb#1274This PR makes
ImageSeries.datarequired and updates the documentation. If "external_file" is provided, then "data" should be set to an empty 3D array.See also discussion here: NeurodataWithoutBorders/pynwb#1220
This is related to #462 which contains broader changes.