[TYPO3-core] Fix bug #2596: While transfering TSconfig-Code from "TSconfig QuickReference" to textarea an "=undefined" value joins the party

[Michael Stucki]

This is a CVS patch request.

Problem:
<quote from bugtracker>
Can you reproduce this "=undefined" if you hit "Transfer & Close" in the 
"TypoScript property lookup" pop-up-window?
 
Example:
 
options {
  showHistory=
}=undefined
</quote from bugtracker>

Answer: Yes I can ;-)

Solution:
Only write in two fields (name + value) if the value is set - otherwise, 
concatenate both values and write them to the "name" field.

Comments:
Some smaller issues described in this bug remain open. I will ask the reporter 
to open a new bug for them.

- michael
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