code: def no_fsl():
      """Checks if FSL is NOT installed
      used with skipif to skip tests that will
      fail if FSL is not installed"""
  
      if Info.version() is None:
          return True
      else:
          return False
  
imports: from glob import glob
  import os
  from ...None import logging
  from ...utils.filemanip import fname_presuffix
  from ..base import traits, isdefined, CommandLine, CommandLineInputSpec, PackageInfo
  from ...external.due import BibTeX
label_desc: Use image node_id 2 for calling a global function with example usage: no_fsl() and returns: True, False