Add check to watcher, to avoid null-error if unknown path is removed.

BUG=
R=kevmoo@google.com

Review URL: https://codereview.chromium.org//428493004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@38846 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 7ab7fd94dd0bf41c0ac148d12533fde666798e1f
  1. example/
  2. lib/
  3. test/
  4. LICENSE
  5. pubspec.yaml
  6. README.md
README.md

A file watcher. It monitors (currently by polling) for changes to contents of directories and notifies you when files have been added, removed, or modified.