Added __isset() magic method. Fixes #181

Author: oscarotero

src/Adapters/Adapter.php

@@ -78,7 +78,7 @@ public function __construct(Response $response, array $config, DispatcherInterfa
     abstract protected function init();
 
     /**
-     * Magic method to execute methods on get paramaters
+     * Magic method to execute methods to return paramaters
      * For example, $source->sourceUrl executes $source->getSourceUrl().
      *
      * @param string $name The property name
@@ -94,6 +94,20 @@ public function __get($name)
         }
     }
 
+    /**
+     * Magic method to execute methods to check if parameters are empty
+     *
+     * @param string $name The property name
+     *
+     * @return bool
+     */
+    public function __isset($name)
+    {
+        $value = $this->$name;
+
+        return !empty($value);
+    }
+
     /**
      * Returns the dispatcher used.
      *

src/Embed.php

@@ -30,7 +30,9 @@ public static function create($url, array $config = [], DispatcherInterface $dis
 
         $info = self::process($url, $config, $dispatcher);
 
-        //if the canonical url is different, repeat the process
+        // Repeat the process if:
+        // - The canonical url is different
+        // - No embed code has found
         $from = preg_replace('|^(\w+://)|', '', rtrim((string) $info->getResponse()->getUrl(), '/'));
         $to = preg_replace('|^(\w+://)|', '', rtrim($info->url, '/'));