Added correction for issue #559
Merge pull request #1046 from Keraunos/SectionCollection_Issue#559

When using sections, the collecting process by clicking directly the name of the group on the submission page doesn't work (if the default due date isn't reached), but it should be, cause the section due date is reached.
However, activating the collecting process in the detailled view of the repository of the group works.
Closes #559