Adding/Editing network proxies doesn't have validation

To replicate:

A. Adding a network proxy
1. Click the Network Proxies link in the left navigation menu
2. Click the Add Network Proxy link in the upper right part of the page
3. Enter invalid values in Identifier, Protocol, Hostname and Port, empty Strings
4. Click the Add Network Proxy button

Result: Network Proxies Administration page displayed, network proxy (identifier="", protocol="", hostname="", port=8080) added
Expected Result: Validation errors

B. Editing a network proxy
1. Click the Network Proxies link in the left navigation menu
2. Click the Edit Network Proxy link in the same row as the network proxy's header
3. Enter invalid values in Protocol, Hostname and Port, empty Strings
4. Click the Save Network Proxy button

Result: Network Proxies Administration page displayed, network proxy updated into (protocol="", hostname="", port=8080)
Expected Result: Validation errors