Index error/ List Index out of range in the Display 3D structure

Expected Behavior

I am trying to use my own template (single PDB in a mmcif format) with single_sequence (msa_mode).

I get the following error in the Display 3D Structure cell:

IndexError Traceback (most recent call last)
in ()
46
47
---> 48 show_pdb(rank_num,show_sidechains, show_mainchains, color).show()
49
50

in show_pdb(rank_num, show_sidechains, show_mainchains, color)
19 model_name = f"rank_{rank_num}"
20 view = py3Dmol.view(js='https://3dmol.org/build/3Dmol.js',)
---> 21 view.addModel(open(pdb_file[0],'r').read(),'pdb')
22
23 if color == "lDDT":

IndexError: list index out of range

Steps to Reproduce (for bugs)

Seq: PHSMRYFETAVSRPGLEEPRYISVGYVDNKEFVRFDSDAENPRYEPRAPWMEQEGPEYWERETQKAKGQEQWFRVSLRNLLGYYNQSAGGSHTLQQMSGCDLGSDWRLLRGYLQFAYEGRDYIALNEDLKTWTAADMAAQITRRKWEQSGAAEHYKAYLEGECVEWLHRYLKNGN:FAPGVFPYM

job_name: test
template mode: custom
Upload the template: 1bz9.cif (downloaded in PDB)

msa_mode: single_sequence
pair Mode: Unpaired+Paired

model_type : auto

Context

Trying to set this PDB as initial guess.

Can you please help resolve this?
Thanks!

Start with the Display 3D Structure cell and the show_pdb function shown in the traceback. Reproduce the job using the 1bz9.cif custom template and inspect why pdb_file has no first element before view.addModel is called. Done means the structure displays without an IndexError for this setup.