Fix fuchsia_ctl recipe failing when running with led.

Change-Id: I60fadfd27b71aed12f467afc7cbbbaacd8838aa1
Bug: https://github.com/flutter/flutter/issues/61694
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/4421
Reviewed-by: Tong Wu <wutong@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>
diff --git a/recipes/fuchsia_ctl.py b/recipes/fuchsia_ctl.py
index 1e08dd6..3f4f413 100644
--- a/recipes/fuchsia_ctl.py
+++ b/recipes/fuchsia_ctl.py
@@ -29,8 +29,8 @@
   packages_git_rev = api.repo_util.checkout(
       'packages',
       packages_dir,
-      api.properties['git_url'],
-      api.properties['git_ref'],
+      api.properties.get('git_url'),
+      api.properties.get('git_ref'),
   )
 
   # Build and uploads a new version of the fuchsia_ctl CIPD package.