Incorrect work of External link editor

Pre-conditions:

• User is registered and logged.
• User has Admin permission for Jcommune.

Steps to reproduce:
Scenario #1
1. Open 'External link editor'
2. Enter valid data in Title and [Space] 3 times in Url
3. Click 'Save'

Actual result: Link with empty Url is created.

Expected result: Error 'URL can't be empty' should be occured. Link with empty Url shouldn't be created.

Scenario #2
1. Open 'External link editor'
2. Enter valid data in Title and more than 512 symbols in Url
3. Click 'Save'

Actual result: Nothing happened.

Expected result: Error 'URL of link length must be between 10 and 512 characters' should be occured.

Scenario #3
1. Open 'External link editor'
2. Enter valid data in Title, Url and [Space] in Hint
3. Click 'Save'

Actual result: Link with empty tooltip is created.

Expected result: No tooltip should be dispayed.

Scenario #4
1. Create the link with hint
2. Open 'External link editor' and edit the link

Actual result: Link with empty hint is shown in editing form.

Expected result: Hint should be displaying in editing form.

Scenario #5
1. Create the link
2. Open 'External link editor' and delete the link
3. Close 'External lionk editor' and then open it again.

Actual result: Deleted link is shown in link editor.

Expected result: Deleted link should not be shown in link editor.

Scenario #6
1. Open 'External link editor'
2. Enter valid data in Title, Url
3. Double click on 'Save'

Actual result: Two identical links are created.

Expected result: Only one link should be created.

Scenario #7
1. Open 'External link editor'
2. Press [Tab]

Actual result: The focus didn’t moved on “Edit link”, “Remove link”.

Expected result: The focus moved in the following order :left –right, top to bottom. The focus moved on all buttons: "Close window", "Edit link", "Remove link", "Add".

Scenario #8
1. Open main page
2. Click on 'Add'
3. Press [Tab]

Actual result: The focus didn’t moved on “Close” button.

Expected result: The focus moved in the following order :left –right, top to bottom. The focus moved on all buttons and fields for editing: "Close window"> fields for editing > "Save" > "Cancel".

Scenario #9
1. Open 'External link editor'
2. Press [Tab]

Actual result: The focus didn’t moved on “Externail link editor”.

Expected result: The focus moved in the following order :left –right, top to bottom. The focus moved should move on “Externail link editor”.