fixup! Use throwing body handler

Author: NSeydoux

rdf4j/src/main/java/com/inrupt/client/rdf4j/RDF4JBodyHandlers.java

@@ -20,11 +20,7 @@
  */
 package com.inrupt.client.rdf4j;
 
-import com.inrupt.client.ClientHttpException;
-import com.inrupt.client.ProblemDetails;
 import com.inrupt.client.Response;
-import com.inrupt.client.spi.JsonService;
-import com.inrupt.client.spi.ServiceProvider;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;