IgnoreErrors option for itemfetchscope, which allows to retrieve all available...

IgnoreErrors option for itemfetchscope, which allows to retrieve all available items even if some of a collection are not available.

This option is used by the etm so collections with incomplete items are still displayed.
(cherry picked from commit 3e1ea295d627ab7b83e505e80f34ddc411c9ebb5)