Make exception reporting best effort.

pkg/analyzer_cli/lib/src/driver.dart

Index: pkg/analyzer_cli/lib/src/driver.dart
diff --git a/pkg/analyzer_cli/lib/src/driver.dart b/pkg/analyzer_cli/lib/src/driver.dart
index 22fec9e634c5a9a13251cbd5c71886b9d6267d89..680b6b3af76ccf6309159b05140be4ce5dea5ff6 100644
--- a/pkg/analyzer_cli/lib/src/driver.dart
+++ b/pkg/analyzer_cli/lib/src/driver.dart
@@ -225,7 +225,9 @@ class Driver implements CommandLineStarter {
     try {
       return await _analyzeAllImpl(options);
     } catch (e, st) {
-      crashReportSender.sendReport(e, stackTrace: st);
+      // Catch and ignore any exceptions when reporting exceptions (network
+      // errors or other).
+      crashReportSender.sendReport(e, stackTrace: st).catchError((_) {});
       rethrow;
     } finally {
       previous.makeCurrent();