check-metadata: skip files that do not exist

If the files don't exist, then they can't have errors, so skip checking.

Change-Id: I3ed4be4912b253c5454df41d690cb33dfe191289
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/540003
Reviewed-by: Gavin Mak <gavinmak@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>

release/check-metadata.py

@@ -90,7 +90,10 @@ def check_license(path: Path, lines: list[str]) -> bool:
 
 def check_path(opts: argparse.Namespace, path: Path) -> bool:
     """Check a single path."""
+    try:
         data = path.read_text(encoding="utf-8")
+    except FileNotFoundError:
+        return True
     lines = data.splitlines()
     # NB: Use list comprehension and not a generator so we run all the checks.
     return all(