[Mewel]

Link to jira.

"delete all objects of type" and "delete object from .. to .." generate the delete commands up front. Children that were already deleted with their parent are now skipped instead of failing (OCFL) or firing a DELETE event for an empty object (ifs2).

• add command "delete existing object {0}" that skips non-existing objects and use it in all commands that generate delete commands
• "delete object {0}" is unchanged and still removes leftovers of objects without metadata
• add tests

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