ITS#884: GSSAPI interoperabity with ActiveDirectory

Improve interoperability when of scred is present but empty.

libraries/libldap/cyrus.c

@@ -564,7 +564,7 @@ ldap_int_sasl_bind(
 		}
 
 		if ( rc != LDAP_SUCCESS && rc != LDAP_SASL_BIND_IN_PROGRESS ) {
-			if( scred ) {
+			if( scred && scred->bv_len ) {
 				/* and server provided us with data? */
 				Debug( LDAP_DEBUG_TRACE,
 					"ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",
@@ -576,7 +576,7 @@ ldap_int_sasl_bind(
 
 		if( rc == LDAP_SUCCESS && saslrc == SASL_OK ) {
 			/* we're done, no need to step */
-			if( scred ) {
+			if( scred && scred->bv_len ) {
 				/* but server provided us with data! */
 				Debug( LDAP_DEBUG_TRACE,
 					"ldap_int_sasl_bind: rc=%d sasl=%d len=%ld\n",