[Regression] Prevent breaking errors when opening a new document in the GENERIC viewer (PR 14158 follow-up) #14192
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In the GENERIC viewer, e.g. when dragging-and-dropping a new PDF document which automatically opens the outline, there can now be breaking errors in the
{BaseViewer, PDFThumbnailViewer}.#getScrollAhead
methods since there's no visible pages/thumbs during loading; sorry about the breakage!