fix: unexpected types in some edge cases (#29)

Author: dkaser

src/usr/local/emhttp/plugins/tailscale/include/Tailscale/Info.php

@@ -143,7 +143,7 @@ public function getKeyExpirationWarning(): ?Warning
 
     public function getTailscaleLockEnabled(): bool
     {
-        return $this->lock->Enabled;
+        return $this->lock->Enabled ?? false;
     }
 
     public function getTailscaleLockSigned(): bool

src/usr/local/emhttp/plugins/tailscale/interface.php

@@ -26,7 +26,7 @@
 
 if (is_resource($process)) {
     if ($_SERVER['REQUEST_METHOD'] == 'POST') {
-        fwrite($pipes[0], $_POST['ts_data']);
+        fwrite($pipes[0], $_POST['ts_data'] ?? "");
         fclose($pipes[0]);
     }