Printing as ASP structure does not print all predicate symbols

[Joachim Jansen]

Running attached file shows that printing as ASP only prints the node type and not the edge relation.

Expected output: node(A). node(B). node(C). edge(A,B). edge(B,C).

Actual output: node(A). node(B). node(C).

[Broes De Cat]

Fixes #407: missing visit in printing predtables as asp.

→ <<cset be9dacbcb305>>

[Broes De Cat]

Fixes #407: missing visit in printing predtables as asp.

→ <<cset fdf2dc30f131>>