Fix NSEC(3) with no bitmap

TODO.markdown

@@ -16,8 +16,6 @@ things that need to be fixed.
 
 ## BUGS
 
-* NSEC3 records with no bitmap (empty non-terminals) are not correctly verified
-    * This means they are not correctly put in wirefmt also;
 * Not completely sure wildcard handling when verifying is correct;
 * Timeouts - they may be set way too short.
 

dnssec_test.go

@@ -162,7 +162,7 @@ func TestDnskey(t *testing.T) {
                 t.Fail()
         }
         // Coefficient looks fishy...
-//        println(pubkey.(*RR_DNSKEY).PrivateKeyString(privkey))
+        t.Logf("%s", pubkey.(*RR_DNSKEY).PrivateKeyString(privkey))
 }
 
 

msg.go

@@ -420,6 +420,11 @@ func packStructValue(val reflect.Value, msg []byte, off int, compression map[str
 				}
 			case "NSEC": // NSEC/NSEC3
 				// This is the uint16 type bitmap
+                                if val.Field(i).Len() == 0 {
+                                        // Do absolutely nothing
+                                        break
+                                }
+
 				lastwindow := uint16(0)
 				length := uint16(0)
 				if off+2 > len(msg) {