Fix false positive in genuine check

this happen when server close ws connection too early
and/or has not sent a "success" event :o

src/components/GenuineCheck.js

@@ -27,6 +27,7 @@ import IconHome from 'icons/Home'
 import IconCheck from 'icons/Check'
 
 const DeviceNotGenuineError = createCustomErrorClass('DeviceNotGenuine')
+const DeviceGenuineSocketEarlyClose = createCustomErrorClass('DeviceGenuineSocketEarlyClose')
 
 type Props = {
   t: T,
@@ -93,6 +94,9 @@ class GenuineCheck extends PureComponent<Props> {
     logger.log(`genuine check resulted ${res} after ${(Date.now() - beforeDate) / 1000}s`, {
       deviceInfo,
     })
+    if (!res) {
+      throw new DeviceGenuineSocketEarlyClose()
+    }
     const isGenuine = res === '0000'
     if (!isGenuine) {
       throw new DeviceNotGenuineError()

static/i18n/en/errors.yml

@@ -5,6 +5,9 @@ BtcUnmatchedApp:
 DeviceNotGenuine:
   title: Possibly not genuine
   description: 'Request Ledger Support assistance.'
+DeviceGenuineSocketEarlyClose:
+  title: Sorry, try again (genuine-close)
+  description:
 DeviceSocketFail:
   title: Oops, try again
   description: 'Some connection failed, so please try again.'