[Bug 21044] Prevent loss of trailing empty lines by formatting script

http://quality.livecode.com/show_bug.cgi?id=21044

Author: BerndN

Toolset/palettes/script editor/behaviors/revsecommoneditorbehavior.livecodescript

@@ -694,6 +694,8 @@ private function textFormatSelection pText
       put return & tTextLines[tIndex] after tResult
    end repeat
 
+   if line - 1 of pText = "" then put cr after tResult
+   
    return tResult
 end textFormatSelection