POS / Wallet apps -Error handling for unavailable dapi/Network connections

[Dju01]

Description:

• GC-2

• When dapi is unavailable, I expect to have an error:
  Server is currently unavailable. Please try again later,

• At this moment we get (see attached)

• The error should appear when:

  • Trying to create wallet
  • Trying to restore wallet
  • Trying to checkout
  • Trying to Quick Deal.