A blank line in the beginning of a textarea is removed.
It is caused for the specification of HTML:
http://www.w3.org/TR/html5/syntax.html#syntax-newlines

A single newline may be placed immediately after the start tag of pre and textarea elements. If the element's contents are intended to start with a newline, two consecutive newlines thus need to be included by the author.

(I could not found the description in HTML4.01)

How to reproduce an issue:

1. Create a new free style project.
2. Check "This build is parameterized"
3. Add "Choice Parameter":
   • Name: PARAM1
   • Choices

     value1
     
     value2
     
     value3
     

4. Save the project configuration.
5. Click "configuration" and go to the project configuration page again.
6. Choices of PARAM1 gets like this:

   value1
   
   value2
   
   value3
   

   • The empty line at the beginning is removed!