Fix dropped errors

cointop/api/coingecko/v3/v3.go

@@ -125,7 +125,7 @@ func (c *Client) SimpleSupportedVSCurrencies() (*types.SimpleSupportedVSCurrenci
 	}
 	var data *types.SimpleSupportedVSCurrencies
 	err = json.Unmarshal(resp, &data)
-	return data, nil
+	return data, err
 }
 
 // CoinsList /coins/list

cointop/portfolio.go

@@ -123,6 +123,9 @@ func (ct *Cointop) setPortfolioHoldings() error {
 	// read input field
 	b := make([]byte, 100)
 	n, err := ct.Views.Input.Backing().Read(b)
+	if err != nil {
+		return err
+	}
 	if n == 0 {
 		return nil
 	}