Sometimes DEP buttons don't work

[bgloyer]

Sometimes clicking the dependency buttons don't jump to the package. If you click DEP and REQ-BY links enough it will eventually get stuck. The problem can be seen on the sample https://pacvis.farseerfc.me tree by following the DEP buttons on the list below.

base-devel
pacman
curl
ca-certificates

When 'curl' is selected the ca-certificates button does not work. Also the package cannot be searched for in this state.

[bgloyer]

I think i fixed this in 1edbeac

the problem was node.label was being set to undefined for distant nodes