Don't assert on edge list bbox size if the edge list is empty.
Don't assert on edge list bbox size if the edge list is empty.

Ignore-this: 2ec45d8a536e882775e04ec52d292f12

darcs-hash:20100710192545-f546f-e8570002d4f5b500796df66f547fcff9bfcabfd8.gz

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