clear market errors after success

cnn_market.go

@@ -88,6 +88,8 @@ func (market *Market) Fetch() (self *Market) {
 	defer func() {
 		if err := recover(); err != nil {
 			market.errors = fmt.Sprintf("Error fetching market data...\n%s", err)
+		} else {
+			market.errors = ""
 		}
 	}()
 

yahoo_quotes.go

@@ -73,6 +73,8 @@ func (quotes *Quotes) Fetch() (self *Quotes) {
 		defer func() {
 			if err := recover(); err != nil {
 				quotes.errors = fmt.Sprintf("\n\n\n\nError fetching stock quotes...\n%s", err)
+			} else {
+				market.errors = ""
 			}
 		}()