[zathura] [PATCH] Initialize bisect state

[Abdó Roig-Maranges]

A small fix for the bisect thing. When opening a new document at page 1, the
bisect algorithm does not understand that it must begin a new bisect, and does
not move from page 0 (the bisect struct is all initialized to 0's).

The attached patch initializes the bisect range to 0, numpages-1, so that the
first bisect always has range the entire document.

Also I attach a small patch regarding empty jumplists. sc_jumplist detects such
case with an assertion. I think it is better to use regular flow control, and
leave assertions for exceptional things that should never happen, like a NULL
zathura pointer.

Abd?.

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