added missing getPermission method

scm-webapp/src/main/java/sonia/scm/security/DefaultSecuritySystem.java

@@ -196,6 +196,30 @@ public class DefaultSecuritySystem implements SecuritySystem
     return availablePermissions;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @param id
+   *
+   * @return
+   */
+  @Override
+  public StoredAssignedPermission getPermission(String id)
+  {
+    assertIsAdmin();
+
+    StoredAssignedPermission sap = null;
+    AssignedPermission ap = store.get(id);
+
+    if (ap != null)
+    {
+      sap = new StoredAssignedPermission(id, ap);
+    }
+
+    return sap;
+  }
+
   /**
    * Method description
    *