Caught exception in plugin method "grub2.setup()" during sosreport execution

Issue

• Running sosreport logs the below error:

$ cat grub2-plugin-errors.txt 
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/sos/sosreport.py", line 1252, in setup
    plug.setup()
  File "/usr/lib/python2.7/site-packages/sos/plugins/grub2.py", line 34, in setup
    "/etc/grub.d"
  File "/usr/lib/python2.7/site-packages/sos/plugins/__init__.py", line 572, in add_copy_spec
    files.sort(key=getmtime, reverse=True)
  File "/usr/lib/python2.7/site-packages/sos/plugins/__init__.py", line 569, in getmtime
    except (OSError, FileNotFoundError):
NameError: global name 'FileNotFoundError' is not defined