Notify the user of missing attachments (#22401).
under certain (rare) circumstances it may happen that, when an issue or other container is saved, added attachments have already been removed (i.e. by the attachments:prune rake task). This patch adds a validation error to the container in this case. Patch by Jens Kraemer. git-svn-id: https://svn.redmine.org/redmine/trunk@15378 e93f8b46-1217-0410-a6f0-8f06a7374b81
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