Don't show error if RSS feeds didn't return any items

internal/widget/rss.go

@@ -18,6 +18,7 @@ type RSS struct {
 	Items           feed.RSSFeedItems     `yaml:"-"`
 	Limit           int                   `yaml:"limit"`
 	CollapseAfter   int                   `yaml:"collapse-after"`
+	NoItemsMessage  string                `yaml:"-"`
 }
 
 func (widget *RSS) Initialize() error {
@@ -45,6 +46,8 @@ func (widget *RSS) Initialize() error {
 		}
 	}
 
+	widget.NoItemsMessage = "No items were returned from the feeds."
+
 	return nil
 }