Don't crash when someone imports a broken QIF (#155244).

[Derek Atkins]

Log Message:
-----------
Don't crash when someone imports a broken QIF (#155244).

	* src/import-export/qif-import/qif-object.scm:
	  provide a default account name so we don't crash when someone
	  imports a broken QIF that has a !Account without an account name.
	  Fixes bug #155244.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/import-export/qif-import:
        qif-objects.scm