Fix handling of Geometries in the Json converter

[Aklakan]

The code in RdfJsonUtils will probably fail with exception for non-WKT geometry literals. Needs to be fixed and tested.

jenax/jenax-arq-parent/jenax-arq-json/src/main/java/org/aksw/jenax/arq/json/RdfJsonUtils.java

Lines 110 to 121 in efa4197

	} else if(obj instanceof GeometryWrapper) {
	WKTReader wktReader = new WKTReader();
	try {
	final Geometry geom = wktReader.read(node.getLiteralLexicalForm());
	GeoJsonWriter geoJsonWriter = new GeoJsonWriter();
	String jsonString = geoJsonWriter.write(geom);
	Gson gson = new Gson();
	result = gson.fromJson(jsonString, JsonObject.class);
	} catch (ParseException e) {
	throw new RuntimeException("Invalid WKT : " + node);
	}