Don't attempt to fit views to empty extents
Merge pull request #1426 from twpayne/view2d-fit-empty-extent

[master] Don't attempt to fit views to empty extents
Merge remote-tracking branch 'ol3/master' into vincenty
Merge remote-tracking branch 'ol3/master' into bearing-arrow-style
Merge remote-tracking branch 'ol3/master' into vector-cubic-bezier
Merge branch 'vincenty' into private-master
Merge branch 'bearing-arrow-style' into private-master
Merge branch 'vector-cubic-bezier' into private-master