all: remove use of errors.Wrap(nil, ...)

clients/horizon/client.go

@@ -289,7 +289,10 @@ func (c *Client) LoadAccountTransactions(accountID string, params ...interface{}
 	}
 
 	err = decodeResponse(resp, &tx)
-	return tx, errors.Wrap(err, "decoding response to transaction")
+	if err != nil {
+		return tx, errors.Wrap(err, "decoding response to transaction")
+	}
+	return tx, nil
 }
 
 // LoadOperation loads a single operation from Horizon server

clients/horizonclient/client.go

@@ -349,7 +349,10 @@ func (c *Client) OperationDetail(id string) (ops operations.Operation, err error
 	}
 
 	ops, err = operations.UnmarshalOperation(baseRecord.GetTypeI(), dataString)
-	return ops, errors.Wrap(err, "unmarshaling to the correct operation type")
+	if err != nil {
+		return ops, errors.Wrap(err, "unmarshaling to the correct operation type")
+	}
+	return ops, nil
 }
 
 // SubmitTransactionXDR submits a transaction represented as a base64 XDR string to the network. err can be either error object or horizon.Error object.

services/ticker/internal/scraper/orderbook_scraper.go

@@ -42,7 +42,10 @@ func (c *ScraperConfig) fetchOrderbook(bType, bCode, bIssuer, cType, cCode, cIss
 	}
 
 	err = calcOrderbookStats(&obStats, summary)
-	return obStats, errors.Wrap(err, "could not calculate orderbook stats")
+	if err != nil {
+		return obStats, errors.Wrap(err, "could not calculate orderbook stats")
+	}
+	return obStats, nil
 }
 
 // calcOrderbookStats calculates the NumBids, BidVolume, BidMax, NumAsks, AskVolume and AskMin