hardship function changes

lib/bma/blockchain/hardship.ex

@@ -16,6 +16,7 @@ defmodule BMA.Blockchain.Hardship do
     {:ok, :block} = :dets.open_file(:block, [{:file, db_block}, {:type, :set}])
     case :dets.match(:block, {:"$1", %{issuer: search}}) do
       [{_key,block_searched}] ->
+
         #exclusion factor calculation
         nbPreviousIssuers = last_block.issuersCount
         nbBlocksSince = last_block.number - block_searched.number
@@ -27,6 +28,10 @@ defmodule BMA.Blockchain.Hardship do
         Poison.encode!(getHardship(exFact, last_block[:powMin], handicap, last_block))
 
       _ ->
+        #last block of the blockchain
+        {:ok, :global_bindex} = :dets.open_file(:global_bindex, [{:file, 'data/global_bindex'}, {:type, :set}])
+        last_block = :ets.match(:global_bindex, {:last_block, :"$1"})
+
         exFact = 1
         powMin = last_block[:powMin]
         handicap = getHandicap(last_block, search)