added default GraphEdgesOptions

Author: a-brandt

src/main/java/com/arangodb/ArangoDriver.java

@@ -5254,6 +5254,10 @@ public <T> EdgeCursor<T> graphGetEdgeCursor(
 		GraphEdgesOptions graphEdgesOptions,
 		AqlQueryOptions aqlQueryOptions) throws ArangoException {
 
+		if (graphEdgesOptions == null) {
+			graphEdgesOptions = new GraphEdgesOptions();
+		}
+
 		validateCollectionName(graphName);
 
 		String query = "for i in graph_edges(@graphName, @vertexExample, @options) return i";