fix(vcs): remove empty string from command in repo.get_tracked_files()

The test should be exercising this code path, so I'm not really sure why
it passes in Taskgraph but failed in another case in CI. Maybe it's
related to the version of Git on the worker.

Author: ahal

src/taskgraph/util/vcs.py

@@ -291,7 +291,10 @@ def _files_template(self, diff_filter):
 
     def get_tracked_files(self, *paths, rev=None):
         rev = rev or "."
-        return self.run("files", "-r", rev, *paths).splitlines()
+        cmd = ["files", "-r", rev]
+        if paths:
+            cmd.extend(paths)
+        return self.run(*cmd).splitlines()
 
     def get_changed_files(self, diff_filter=None, mode=None, rev=None, base_rev=None):
         diff_filter = diff_filter or "ADM"
@@ -477,7 +480,10 @@ def get_commit_message(self, revision=None):
 
     def get_tracked_files(self, *paths, rev=None):
         rev = rev or "HEAD"
-        return self.run("ls-tree", "-r", "--name-only", rev, *paths).splitlines()
+        cmd = ["ls-tree", "-r", "--name-only", rev]
+        if paths:
+            cmd.extend(paths)
+        return self.run(*cmd).splitlines()
 
     def get_changed_files(self, diff_filter=None, mode=None, rev=None, base_rev=None):
         diff_filter = diff_filter or "ADM"