Fix for NPE in the index store.

pkg/analysis_server/lib/src/services/index/store/split_store.dart

Index: pkg/analysis_server/lib/src/services/index/store/split_store.dart
diff --git a/pkg/analysis_server/lib/src/services/index/store/split_store.dart b/pkg/analysis_server/lib/src/services/index/store/split_store.dart
index e816fbb4caba57a59ed671679d182a9a23cb7004..d16d29a5b998cddab709f69030e8589069437060 100644
--- a/pkg/analysis_server/lib/src/services/index/store/split_store.dart
+++ b/pkg/analysis_server/lib/src/services/index/store/split_store.dart
@@ -684,7 +684,10 @@ class SplitIndexStore implements IndexStore {
   @override
   void recordRelationship(Element element, Relationship relationship,
       Location location) {
-    if (element == null || location == null) {
+    if (element == null || element.location == null) {
+      return;
+    }
+    if (location == null) {
       return;
     }
     // special support for UniverseElement