Nicer looking exit when blockchain.bin is found

Do not print the exception message, and write the important bit
in red, since people will only read the last line otherwise.

src/daemon/daemon.cpp

@@ -118,7 +118,8 @@ bool t_daemon::run(bool interactive)
 
   try
   {
-    mp_internals->core.run();
+    if (!mp_internals->core.run())
+      return false;
     mp_internals->rpc.run();
 
     daemonize::t_command_server* rpc_commands;