error: remove shortening of node in error message
This makes it difficult to figure what exactly was node on which LookupError was called if we only have the error message.
I was debugging an error message which contained a short node and I tried to find out which callers raise LookupError with a short node. This turned out to be wrong because we short-ed the node before printing.
If a short node is to be displayed, that should be done by callers.