Fix a TypeError when no admin rules are registered

https://bugs.freedesktop.org/show_bug.cgi?id=63575

1 files changed, 1 insertions, 1 deletions

diff --git a/src/polkitbackend/init.js b/src/polkitbackend/init.js
index af85d05..79c80b6 100644
--- a/src/polkitbackend/init.js
+++ b/src/polkitbackend/init.js
@@ -59,7 +59,7 @@ polkit._runAdminRules = function(action, subject) {
             break
         }
     }
-    return ret.join(",");
+    return ret ? ret.join(",") : "";
 };
 
 polkit._ruleFuncs = [];