[poppler] [Patch] Fix another links crash

[Marco Pesenti Gritti]

Hi,

the problem is that the glib implementation assumes (as documented in
Outline.h) that getItems will return NULL when there are no items, not
an empty list.
The patch fix it by deleting the list if it's empty.

Alternatively we could fix the glib api to check for list length, we
should fix Outline.h docs too.

Marco
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