Empty proxy-info information will be created in config.xml by updating the FishEye UI without editing it when http bind option is empty

The following tag will be created automatically when clicking on the update in the FishEye UI although there is no changes added:

<proxy-info proxy-host="" proxy-scheme=""/>

Steps to replicate:

1. Make sure FishEye is accessible via https protocol
2. Make sure the FishEye config.xml only have the following tag:

   <proxy-info\>
   

3. Start the FishEye server
4. Go to the server setting via FishEye administrator >> Server >> Web server
5. Click on Edit setting
6. Make sure the HTTP Bind is empty
7. Click Update

With the following tag created with empty string:

<proxy-info proxy-host="" proxy-scheme=""/>

User will face the following bug:

• https://jira.atlassian.com/browse/CRUC-4697