Fix crash when the delta link is expired

CHANGELOG.md

@@ -3,6 +3,10 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+### Fixed
+- Crash when the delta link is expired
+
 ## [1.1.1] - 2018-01-20
 ### Fixed
 - Wrong regex for parsing authentication uri

src/sync.d

@@ -160,7 +160,7 @@ final class SyncEngine
 		JSONValue changes;
 		string deltaLink = itemdb.getDeltaLink(driveId, id);
 		log.vlog("Applying changes of " ~ id);
-		do {
+		for (;;) {
 			try {
 				changes = onedrive.viewChangesById(driveId, id, deltaLink);
 			} catch (OneDriveException e) {
@@ -181,7 +181,8 @@ final class SyncEngine
 			if ("@odata.deltaLink" in changes) deltaLink = changes["@odata.deltaLink"].str;
 			if (deltaLink) itemdb.setDeltaLink(driveId, id, deltaLink);
 			if ("@odata.nextLink" in changes) deltaLink = changes["@odata.nextLink"].str;
-		} while ("@odata.nextLink" in changes);
+			else break;
+		}
 
 		// delete items in idsToDelete
 		if (idsToDelete.length > 0) deleteItems();