Handle missing image segment data for MSG/XRIT

pytroll / mipp

This is a Meteorological Ingest-Processing Package (MIPP)

https://mipp.readthedocs.org/

GNU Lesser General Public License v3.0

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Handle missing image segment data for MSG/XRIT #12

Closed pnuu closed 6 years ago

pnuu commented 6 years ago

This PR adds exception handling for situations where there are no image data segments. Previously IndexError was raised and that was not handled in calling methods. Now the IndexError is caught and ReaderError is raised instead.