[Gambas-user] segfault on PDF

[Ian Haywood]

Currently the gambas PDF viewer segfaults when loading this PDF.
The PDF probably has a corrupted index, but I think gambas could deal with 
more gracefully (by not displaying the index, but still the pages of the PDF)
which is what other poppler-based tools can do.

This patch (to both the pdf component and the example viewer) fixes the issue.

Ian Haywood
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