Fix check for empty rconpassword in CL_Rcon_f

code/client/cl_main.c

@@ -1820,7 +1820,7 @@ void CL_Rcon_f( void ) {
 	char	message[MAX_RCON_MESSAGE];
 	netadr_t	to;
 
-	if ( !rcon_client_password->string ) {
+	if ( !rcon_client_password->string[0] ) {
 		Com_Printf ("You must set 'rconpassword' before\n"
 					"issuing an rcon command.\n");
 		return;