[stable33] fix(files_sharing): don't crash CleanupShareTarget when mount info is missing - #64366
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… missing The repair step "Cleanup share names with false conflicts" fatals with "Call to a member function getRootId() on null" when a problem share's old target has no entry in the recipient's cached mounts (e.g. the recipient has not logged in since the share was created). Guard the lookup the same way the generateUniqueTarget callback already does and skip the mount cache refresh in that case - the share row is already updated by moveShare() and the cache is rebuilt on the user's next login. Fixes #63494 Signed-off-by: Baki Burak Öğün <63836730+bakiburakogun@users.noreply.github.com>
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Backport of PR #63495