More fixes for failures on the Windows bot

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index 723c9c7d069b5c06c9c1711c971f5b87e2e164f3..9fc4c16d1cdb1ce38b0f4ae65b3c5ccbb02fac71 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -437,7 +437,7 @@ class ContextManagerImpl implements ContextManager {
    */
   ContextInfo getContextInfoFor(Folder folder) {
     ContextInfo info = _getInnermostContextInfoFor(folder.path);
-    if (folder == info.folder) {
+    if (info != null && folder == info.folder) {
       return info;
     }
     return null;