Forwarded from https://bugzilla.redhat.com/show_bug.cgi?id=1119520

Using a parser in submenu Output parsers on a non-saved file produces an error:

1. Open Bluefish
2. File → new from template → XHTML 1.0
3. Tags → Headings → H1 (For instance)
4. Write a word in the h1 tag.
5. Tools → Output parsers → xmllint XML checker

Actual results:
"Failed to create a command for xmllint --noout --valid '%f'|."
The same thing occurs if, instead of a XHTML file, you create a new PHP file and launch "php syntax check". In this case, the result is:
"Failed to create a command for php -l -q -f '%f'|."

Expected results:
The checker should work even if the file is not saved, or, at least, the error message should be clear: "The checker only works on saved files. Please save your file first."