Skip deleted files in presubmit.

Change-Id: I9998b3b606773ca1fdc5330c311820f977506b13

pw_presubmit/py/pw_presubmit/tools.py

diff --git a/pw_presubmit/py/pw_presubmit/tools.py b/pw_presubmit/py/pw_presubmit/tools.py
index 5fa3a4b..644cabb 100644
--- a/pw_presubmit/py/pw_presubmit/tools.py
+++ b/pw_presubmit/py/pw_presubmit/tools.py
@@ -99,8 +99,14 @@
     """Returns absolute paths of files changed since the specified commit."""
     root = git_repo_path(repo=repo)
     return [
-        os.path.abspath(os.path.join(root, path)) for path in git_stdout(
-            'diff', '--name-only', commit, '--', *paths, repo=repo).split()
+        os.path.abspath(os.path.join(root, path))
+        for path in git_stdout('diff',
+                               '--name-only',
+                               '--diff-filter=d',
+                               commit,
+                               '--',
+                               *paths,
+                               repo=repo).split()
     ]