Use an image for feeds that don’t have favicons. Currently using the image at /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/BookmarkIcon.icns — but this might change.

Evergreen/AppDelegate.swift

@@ -27,6 +27,12 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations,
 	var feedIconDownloader: FeedIconDownloader!
 	var appName: String!
 
+	lazy var genericFeedImage: NSImage? = {
+		let path = "/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/BookmarkIcon.icns"
+		let image = NSImage(contentsOfFile: path)
+		return image
+	}()
+
 	var unreadCount = 0 {
 		didSet {
 			if unreadCount != oldValue {

Evergreen/FeedList/FeedListViewController.swift

@@ -111,7 +111,10 @@ extension FeedListViewController: NSOutlineViewDelegate {
 			return NSImage(named: NSImage.Name.folder)
 		}
 		else if let feed = node.representedObject as? FeedListFeed {
-			return appDelegate.faviconDownloader.favicon(withHomePageURL: feed.homePageURL)
+			if let image = appDelegate.faviconDownloader.favicon(withHomePageURL: feed.homePageURL) {
+				return image
+			}
+			return appDelegate.genericFeedImage
 		}
 		return nil
 	}

Evergreen/MainWindow/Sidebar/SidebarViewController.swift

@@ -522,7 +522,10 @@ private extension SidebarViewController {
 extension Feed: SmallIconProvider {
 
 	var smallIcon: NSImage? {
-		return appDelegate.faviconDownloader.favicon(for: self)
+		if let image = appDelegate.faviconDownloader.favicon(for: self) {
+			return image
+		}
+		return appDelegate.genericFeedImage
 	}
 }