Jira 770 CurieBLE: peripheral.deviceName() returns empty String

I'm using the peripheral explorer with [bleno's echo example](https://github.com/sandeepmistry/bleno/tree/master/examples/echo). `peripheral.deviceName()` return an empty string. I expect it to return `raspberrypi`.

Here's the output:
```
BLE Central - Peripheral Explorer
Found C8:69:CD:41:84:A2 ''
Found 00:19:0E:11:24:06 '' ec00
Connecting ...
Connected
Discovering attributes ...
Attributes discovered

Device name:
Service 1800
Service 1801
Service ec00
Characteristic ec0e, properties 0x26

Disconnecting ...
Disconnected
```

Might be related to #378.

Start by reproducing the issue with the peripheral explorer and bleno's echo example, then trace the peripheral.deviceName() entry point and review the related discussion in #378. Done means the explorer reports the peripheral name as "raspberrypi" instead of an empty string.

Written by the indexing model from the issue text.