[&1.5] Issue 2715:	Formatted XML is not displayed in the browser when viewing an XML file
[&1.5] Issue 2715:	Formatted XML is not displayed in the browser when viewing an XML file

Changes:
- XML Pretty Print check: Cleanup logging and error handling

http://code.google.com/p/fbug/source/detail?r=5946

firebug/tracing-console,firebug/tracing-console