Duplicate RTREE_REFERENCE relation

[ivantk]

Hello,

I noticed that with the latest plugin version the RTREE_REFERENCE relation between the spatial nodes and layer is created every time the addNodeToLayer is called for the node. It wasn't that case with the older version. Since there is no way to check if a spatial node is already added, I merge my data nodes with a specific spatial and then call addNodeToLayer for this spatial every time.

[ehx-v1]

I'm not quite into Neo4j Spatial yet but all around the other issues the first answer I see is "can you give a failing test?" so just a hint, you'd better already prepare one also, on trying to make a failing test you'll perhaps find out it doesn't dupe at all because of some other mechanism already handling that, who knows? ;-) and just in case you drop some remark about people having nothing to do other than reading random issues on Git projects they merely came in touch with, I'm simply interested in it OK?