roomservice: add repo to syncable repo list if dir doesn't exist

breakfast may get stuck if the first breakfast for a target is
interrupted before cloning but after adding repositories to local
manifest. Re-doing breakfast skips syncing the repositories if
they're added to the manifest even if not cloned.

Change-Id: Ifefd08fa6da8785c1d5de0b27ac1a08a782f21d6

build/tools/roomservice.py

@@ -233,6 +233,9 @@ def fetch_dependencies(repo_path, fallback_branch = None):
             else:
                 verify_repos.append(dependency['target_path'])
 
+            if not os.path.isdir(dependency['target_path']):
+                syncable_repos.append(dependency['target_path'])
+
         dependencies_file.close()
 
         if len(fetch_list) > 0: