Merge pull request #2402 from dafriend/RouteCollection-remove-superfl…

…uous-check

Removed pointless isset() check

system/Router/RouteCollection.php

@@ -1382,7 +1382,7 @@ protected function create(string $verb, string $from, $to, array $options = null
 		}
 
 		// Limiting to subdomains?
-		else if (isset($options['subdomain']) && ! empty($options['subdomain']))
+		else if (! empty($options['subdomain']))
 		{
 			// If we don't match the current subdomain, then
 			// we don't need to add the route.