Crash on scanning to soon after un-successfull connection in Master/Bluetooth mode

[dlktdr]

If you discover, click a bluetooth address that doesn't allow a connection and then click discover again before waiting a while it will crash the Bluetooth on the board.

 W (224519) BT_APPL:  bta_dm_ble_scan start scan failed. status=0x3

E (224523) BT_HCI: CC evt: op=0x200c, status=0xc
E (224527) BTCLIENT: scan start failed, error status = 1