Created dashboard`s default page`s name filed is not prefilled at Dashboard page properties dialogue window.

Steps to reproduce:

1. Navigate to Monitoring -> Dashboard
2. Create Dashboard
3. Open created dashboard
4. Navigate to default page`s options and press properties

Expected result: At Dashboard page properties dialogue window field Name should have prefilled page`s name Page 1
Actual result: At Dashboard page properties dialogue window field Name is not prefilled with page`s name