BLAST::Job#imported_xml_file: check that instance var is truthy first
BLAST::Job#imported_xml_file: check that instance var is truthy first

Signed-off-by: Anurag Priyam <6e6ab5ea9cb59fe7c35d2a1fc74443577eb60635@gmail.com>

yeban/sequenceserver,yeban/sequenceserver,yeban/sequenceserver,yeban/sequenceserver