Make exception reporting best effort.

pkg/analysis_server/lib/src/analysis_server.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core';
 import 'dart:io' as io;
 import 'dart:math' show max;
 
@@ skipping 763 matching lines @@
       buffer.writeln();
       buffer.write(stackTrace);
     }
 
     // send the notification
     channel.sendNotification(
         new ServerErrorParams(fatal, message, buffer.toString())
             .toNotification());
 
     // send to crash reporting
-    options.crashReportSender?.sendReport(exception, stackTrace: stackTrace);
+    if (options.crashReportSender != null) {
+      // Catch and ignore any exceptions when reporting exceptions (network
+      // errors or other).
+      options.crashReportSender
+          .sendReport(exception, stackTrace: stackTrace)
+          .catchError((_) {});
+    }
 
     // remember the last few exceptions
     if (exception is CaughtException) {
       stackTrace ??= exception.stackTrace;
     }
     exceptions.add(new ServerException(message, exception, stackTrace, fatal));
   }
 
   /**
    * Send status notification to the client. The state of analysis is given by
@@ skipping 694 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = server.createChild('requests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }