fix strict null errors

src/vs/editor/contrib/wordHighlighter/wordHighlighter.ts

@@ -106,7 +106,7 @@ abstract class OccurenceAtPositionRequest implements IOccurenceAtPositionRequest
 
 class SemanticOccurenceAtPositionRequest extends OccurenceAtPositionRequest {
 	protected _compute(model: ITextModel, selection: Selection, wordSeparators: string, token: CancellationToken): Promise<DocumentHighlight[]> {
-		return getOccurrencesAtPosition(model, selection.getPosition(), token);
+		return getOccurrencesAtPosition(model, selection.getPosition(), token).then(value => value || []);
 	}
 }
 

src/vs/platform/url/common/urlService.ts

@@ -20,7 +20,7 @@ export class URLService implements IURLService {
 
 	open(uri: URI): Promise<boolean> {
 		const handlers = Array.from(this.handlers);
-		return first(handlers.map(h => () => h.handleURL(uri)), undefined, false);
+		return first(handlers.map(h => () => h.handleURL(uri)), undefined, false).then(val => val || false);
 	}
 
 	registerHandler(handler: IURLHandler): IDisposable {