Fix for collected graph items now showing up in viz

[oskarhane]

When extracting graph items from result only the first level was checked. This fixes that so we recursively check the complete response and extract all items.

Consider the query (on the movie dataset):

MATCH (p:Person{name:'Keanu Reeves'})-[:ACTED_IN]->(m:Movie)
RETURN p, collect(m)

Before:

After:

Fixes #528

[oskarhane]

Updated @pe4cey