Remove a fileitem from the PreviewJob when it disappears

Davide Gianforterequested to merge
gengisdave/krusader:previews into master

When a file is updating (e.g. downloading, slow write, ...), Krusader crashes if the KIO::PreviewJob ends after the view is updated (no item to update).

BUG: 425528 FIXED: [ 425528 ] Crash when synching folders

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