Properly handle the case where a pagetree not is completely missing.
Properly handle the case where a pagetree not is completely missing.

darcs-hash:20081206120749-86a4e-17217027b4b2271695f33c5492eab76e45d375af.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf