Issue 21373. Fix for removing line info in case of exception (causes NPE in outline computer).

pkg/analysis_server/lib/src/operation/operation_analysis.dart

Index: pkg/analysis_server/lib/src/operation/operation_analysis.dart
diff --git a/pkg/analysis_server/lib/src/operation/operation_analysis.dart b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
index d9e46f24e35540fcd8d3a7f22ce30e74beb8f6e2..12af380c2309ad1dab841d7526eda2fd1b1510cd 100644
--- a/pkg/analysis_server/lib/src/operation/operation_analysis.dart
+++ b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
@@ -49,9 +49,9 @@ void sendAnalysisNotificationOccurrences(AnalysisServer server, String file,
 
 
 void sendAnalysisNotificationOutline(AnalysisServer server,
-    AnalysisContext context, Source source, CompilationUnit dartUnit) {
+        Source source, LineInfo lineInfo, CompilationUnit dartUnit) {
   server.sendNotification(new protocol.AnalysisOutlineParams(source.fullName,
-      new DartUnitOutlineComputer(context, source,
+      new DartUnitOutlineComputer(source, lineInfo,
           dartUnit).compute()).toNotification());
 }
 
@@ -127,7 +127,8 @@ class PerformAnalysisOperation extends ServerOperation {
           sendAnalysisNotificationOccurrences(server, file, dartUnit);
         }
         if (server.hasAnalysisSubscription(protocol.AnalysisService.OUTLINE, file)) {
-          sendAnalysisNotificationOutline(server, context, source, dartUnit);
+          LineInfo lineInfo = notice.lineInfo;
+          sendAnalysisNotificationOutline(server, source, lineInfo, dartUnit);
         }
         if (server.hasAnalysisSubscription(protocol.AnalysisService.OVERRIDES, file)) {
           sendAnalysisNotificationOverrides(server, file, dartUnit);