More strong mode changes in analysis_server

pkg/analysis_server/lib/src/services/search/hierarchy.dart

Index: pkg/analysis_server/lib/src/services/search/hierarchy.dart
diff --git a/pkg/analysis_server/lib/src/services/search/hierarchy.dart b/pkg/analysis_server/lib/src/services/search/hierarchy.dart
index f3ad992834dbbb71bf075072f68cd289c84c03a0..c6b552f523c018479ee88c1bbe67bca2262b3db1 100644
--- a/pkg/analysis_server/lib/src/services/search/hierarchy.dart
+++ b/pkg/analysis_server/lib/src/services/search/hierarchy.dart
@@ -35,13 +35,13 @@ List<Element> getClassMembers(ClassElement clazz, [String name]) {
   List<Element> members = <Element>[];
   visitChildren(clazz, (Element element) {
     if (element.isSynthetic) {
-      return;
+      return false;
     }
     if (element is ConstructorElement) {
-      return;
+      return false;
     }
     if (name != null && element.displayName != name) {
-      return;
+      return false;
     }
     if (element is ExecutableElement) {
       members.add(element);
@@ -49,6 +49,7 @@ List<Element> getClassMembers(ClassElement clazz, [String name]) {
     if (element is FieldElement) {
       members.add(element);
     }
+    return false;
   });
   return members;
 }