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So far any exception occuring during the construction of the ctools were not catched. This is corrected now.
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The ctool::get_roi() replaces some duplicated code in ctselect and ctcubemask. The method extracts the RoI from the user parameters "ra", "dec" and "rad". In case the "usepnt" parameter is present and set to "yes", the "ra" and "dec" parameters will not be read, and it's up to the client to set the RoI centre properly.
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…no selection was performed)
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The processing for empty event files is skipped. The file is simply written out empty again.
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…(see #1360 for details).