fix: missing undefined check on policy_changes (#122)

* feat: add nix shell

Signed-off-by: Amy <amy+git@amogus.cloud>

* fix: missing undefined check in policy_changes

Signed-off-by: Amy <amy+git@amogus.cloud>

---------

Signed-off-by: Amy <amy+git@amogus.cloud>

Author: amycatgirl

src/events/v1.ts

@@ -322,7 +322,7 @@ export async function handleEvent(
       setReady(true);
       client.emit("ready");
 
-      if (event.policy_changes.length) {
+      if (event.policy_changes?.length) {
         client.emit("policyChanges", event.policy_changes, async () =>
           client.api.post("/policy/acknowledge"),
         );