Traceback (most recent call last):
  File "/fast/work/meta-security-tools/scripts/sdl-whitelist-status.py", line 97, in <module>
    tinfoil.parse_recipe('multiconfig:qemuarm:gcc')
  File "/fast/work/bitbake/lib/bb/tinfoil.py", line 350, in parse_recipe
    return self.parse_recipe_file(fn)
  File "/fast/work/bitbake/lib/bb/tinfoil.py", line 373, in parse_recipe_file
    dscon = self.run_command('parseRecipeFile', fn, appends, appendlist)
  File "/fast/work/bitbake/lib/bb/tinfoil.py", line 281, in run_command
    raise TinfoilCommandFailed(result[1])
bb.tinfoil.TinfoilCommandFailed: Traceback (most recent call last):
  File "/fast/work/bitbake/lib/bb/command.py", line 81, in runCommand
    result = command_method(self, commandline)
  File "/fast/work/bitbake/lib/bb/command.py", line 521, in parseRecipeFile
    appendfiles = command.cooker.collection.get_file_appends(fn)
  File "/fast/work/bitbake/lib/bb/cooker.py", line 1961, in get_file_appends
    f = os.path.basename(fn)
  File "/usr/lib/python3.4/posixpath.py", line 139, in basename
    i = p.rfind(sep) + 1
AttributeError: 'NoneType' object has no attribute 'rfind'

'multiconfig:qemuarm:gcc' is a valid pn because of:
$ cat conf/multiconfig/qemuarm.conf 
MACHINE = "qemuarm"
$ grep -e ^BBMULTICONFIG -e ^MACHINE conf/local.conf
MACHINE ?= "intel-corei7-64"
BBMULTICONFIG = "qemuarm"

Looks like fn = self.get_recipe_file(pn) fails to find the file name.

Note that there's also no error handling when passing some entirely invalid pn. tinfoil.parse_recipe('foobar') fails the same way.