[analyzer] Don't run lints for files that don't exist

Fixes https://github.com/Dart-Code/Dart-Code/issues/5343

Change-Id: I428d3f38334503bb1285afd157ebb5440e0912ed
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/398881
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>

https://dart.googlesource.com/sdk/+/bb4850bb8d42098bc29dea42a8a99f0051c2cfba

DEPS

diff --git a/DEPS b/DEPS
index 82f8d4f..ca9bae5 100644
--- a/DEPS
+++ b/DEPS
@@ -258,7 +258,7 @@
 
   'engine/src/flutter': Var('flutter_git') + '/mirrors/engine' + '@' + '9e8fcad4eaf6c266f032ea9ec304739fb316a7dc',
 
-  'engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '239b5c2606f1da0ad664422646468839a1376b04',
+  'engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + 'bb4850bb8d42098bc29dea42a8a99f0051c2cfba',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + 'a72ad5473b1639a5f54eabc858567821f387f0a6',
 

commits.json

diff --git a/commits.json b/commits.json
index 7e3289a..c8d43e7 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"9e8fcad4eaf6c266f032ea9ec304739fb316a7dc",
-  "engine/src/flutter/third_party/dart":"239b5c2606f1da0ad664422646468839a1376b04",
+  "engine/src/flutter/third_party/dart":"bb4850bb8d42098bc29dea42a8a99f0051c2cfba",
   "flutter":"a72ad5473b1639a5f54eabc858567821f387f0a6"
 }
\ No newline at end of file