I am getting this error every time I run the cif2cell script, How can I solve the problem?
$ cif2cell -f graphenerelaxed.cif -p quantum-espresso
Traceback (most recent call last):
File "/home/sylvester/.local/bin/cif2cell", line 1574, in
docstring = StandardDocstring()
File "/home/sylvester/.local/bin/cif2cell", line 1021, in StandardDocstring
tmpstring2 += ". Reference number : "+ref.databasecode
TypeError: must be str, not NoneType