Models the feed identifier of feedly articles as an optional since it seems the Feedly API will not always provide one (despite the API documentation).

Additional, more elegantly handle the failure to parse an article when Feedly does not provide a matching feed.

Frameworks/Account/Feedly/Models/FeedlyEntryParser.swift

@@ -17,10 +17,10 @@ struct FeedlyEntryParser {
 		return entry.id
 	}
 	
-	var feedUrl: String {
+	var feedUrl: String? {
 		guard let id = entry.origin?.streamId else {
 			assertionFailure()
-			return ""
+			return nil
 		}
 		return id
 	}
@@ -82,7 +82,11 @@ struct FeedlyEntryParser {
 		return attachments.isEmpty ? nil : Set(attachments)
 	}
 	
-	var parsedItemRepresentation: ParsedItem {
+	var parsedItemRepresentation: ParsedItem? {
+		guard let feedUrl = feedUrl else {
+			return nil
+		}
+		
 		return ParsedItem(syncServiceID: id,
 						  uniqueID: id, // This value seems to get ignored or replaced.
 						  feedURL: feedUrl,

Frameworks/Account/Feedly/Models/FeedlyOrigin.swift

@@ -10,6 +10,6 @@ import Foundation
 
 struct FeedlyOrigin: Decodable {
 	var title: String?
-	var streamId: String
+	var streamId: String?
 	var htmlUrl: String
 }

Frameworks/Account/Feedly/Operations/FeedlyGetStreamContentsOperation.swift

@@ -50,7 +50,17 @@ final class FeedlyGetStreamContentsOperation: FeedlyOperation, FeedlyEntryProvid
 			return entries
 		}
 		
-		let parsed = Set(entries.map { FeedlyEntryParser(entry: $0).parsedItemRepresentation })
+		let parsed = Set(entries.compactMap {
+			FeedlyEntryParser(entry: $0).parsedItemRepresentation
+		})
+		
+		if parsed.count != entries.count {
+			let entryIds = Set(entries.map { $0.id })
+			let parsedIds = Set(parsed.map { $0.uniqueID })
+			let difference = entryIds.subtracting(parsedIds)
+			os_log(.debug, log: log, "Dropping articles with ids: %{public}@.", difference)
+		}
+		
 		storedParsedEntries = parsed
 		
 		return parsed