Ivanb/notifications (#78)

* [TX] add empty asset validation

* Revert "[TX] add empty asset validation"

This reverts commit 66e99cc

* [TX] fix undelegation & claim rewards addresses

* [TX] fix tests

types/v1/tx.go

@@ -259,10 +259,8 @@ func (t *Tx) GetAddresses() []string {
 		return append(addresses, t.From, t.To)
 	case TxContractCall:
 		return append(addresses, t.From, t.To)
-	case TxStakeDelegate, TxStakeRedelegate:
+	case TxStakeDelegate, TxStakeRedelegate, TxStakeUndelegate, TxStakeClaimRewards:
 		return append(addresses, t.From)
-	case TxStakeUndelegate, TxStakeClaimRewards:
-		return append(addresses, t.To)
 	default:
 		return addresses
 	}

types/v1/tx_test.go

@@ -154,7 +154,17 @@ func TestTx_GetAddresses(t *testing.T) {
 				To:       "to",
 				Metadata: &Transfer{},
 			},
-			expected: []string{"to"},
+			expected: []string{"from"},
+		},
+		{
+			name: "claim_rewards",
+			tx: Tx{
+				Type:     TxStakeClaimRewards,
+				From:     "from",
+				To:       "to",
+				Metadata: &Transfer{},
+			},
+			expected: []string{"from"},
 		},
 		{
 			name: "contract_call",