minor adjustments to RouterAddress testcase

core/java/test/net/i2p/data/RouterAddressTest.java

@@ -58,6 +58,7 @@ public class RouterAddressTest extends StructureTest {
         addr.setOptions(options);
         addr.setTransportStyle("Blah");
         assertFalse(addr.equals(null));
+        assertFalse(addr.equals(""));
     }
     
     public void testToString(){
@@ -73,5 +74,7 @@ public class RouterAddressTest extends StructureTest {
         addr.setOptions(options);
         addr.setTransportStyle("Blah");
         addr.toString();
+        addr.setOptions(null);
+        addr.toString();
     }
 }