[Bugfix] Allow zero as a resource id (#179)

Co-authored-by: David Cedeño <[email protected]>

Author: dacercoolex

src/Routing/Route.php

@@ -99,7 +99,9 @@ public function modelOrResourceId()
             throw new LogicException('No JSON API resource id name set on route.');
         }
 
-        if ($modelOrResourceId = $this->route->parameter($name)) {
+        $modelOrResourceId = $this->route->parameter($name);
+
+        if (!empty($modelOrResourceId) || '0' === $modelOrResourceId) {
             return $modelOrResourceId;
         }