CRM_Extension_Container_AllTests - Fix error about abstract method

CRM/Extension/Container/Collection.php

@@ -86,7 +86,8 @@ class CRM_Extension_Container_Collection implements CRM_Extension_Container_Inte
     }
     return $errors;
   }
-    /**
+
+  /**
    * {@inheritdoc}
    */
   public function getKeys() {

CRM/Extension/Container/Static.php

@@ -40,6 +40,13 @@ class CRM_Extension_Container_Static implements CRM_Extension_Container_Interfac
     $this->exts = $exts;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function checkRequirements() {
+    return array();
+  }
+
   /**
    * {@inheritdoc}
    */