Guard against null pointer exception in status page generation

pkg/analysis_server/lib/src/status/get_handler.dart

Index: pkg/analysis_server/lib/src/status/get_handler.dart
diff --git a/pkg/analysis_server/lib/src/status/get_handler.dart b/pkg/analysis_server/lib/src/status/get_handler.dart
index 8d619370c6846a148589094744c5b9ca89967711..b359dd5de4e396153c91aeb6e8b19582eb3dd7f5 100644
--- a/pkg/analysis_server/lib/src/status/get_handler.dart
+++ b/pkg/analysis_server/lib/src/status/get_handler.dart
@@ -377,7 +377,8 @@ class GetHandler {
     MapIterator<AnalysisTarget, CacheEntry> iterator =
         context.analysisCache.iterator();
     while (iterator.moveNext()) {
-      if (iterator.value.exception != null) {
+      CacheEntry entry = iterator.value;
+      if (entry != null && entry.exception != null) {

[scheglov, 2015/11/11 22:46:12]

Should we log / write-to-the-page the key for which we were not able to get the
entry?

         return true;
       }
     }