Implement __get() placeholder to prevent a flood of E_NOTICE

classes/context/Context.class.php

@@ -1945,6 +1945,19 @@ class Context
 		return $url[$ssl_mode][$domain_key];
 	}
 
+	/**
+	 * Magic method to return null instead of throwing E_NOTICE when undefined properties are accessed
+	 * 
+	 * We do not define a corresponding __set() because it does not work with assignment by reference.
+	 * 
+	 * @param string $key
+	 * @return null
+	 */
+	public function __get($key)
+	{
+		return null;
+	}
+
 	/**
 	 * Set a context value with a key
 	 *