NPE in JsonImporter with primitive edge

There's an issue in the importer when a primitive edge is imported that has no port in #transformPrimitiveEdge()

val srcNode = nodeIdMap.get(jsonObj.optString("source"))

val srcPort = portIdMap.get(jsonObj.optString("sourcePort"))

if (srcPort.parent != srcNode)

Obviously, an NPE is thrown if srcPort is null.

A workaround is to use Extended Edges as described in the javadoc of the JsonFormatHandler  class:

 
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