Unpaired single sequence MSA mode does not work (with Multimer v2)

Expected Behavior

Colabfold returns a structure

Current Behavior

TypeError: 'NoneType' object is not subscriptable

Steps to Reproduce (for bugs)

Seq: ENQALEQKNAQLKQEIAALEQEIAQLEY:KNAQLKEENAALEEKIQQLKEKIQALKY:ENQALEQEIAQLEQEIAALEQKNAQLKY:KNAQLKEKIAALKEKIQQLKEENQALEY

Name: P9P10P11P12_unpaired
MSA_Mode: single
pair_mode: unpaired

ColabFold Output (for bugs)

Downloading alphafold2 weights to .: 100%|██████████| 3.82G/3.82G [00:32<00:00, 127MB/s] 
2022-03-18 09:09:25,521 Running colabfold 1.2.0 (62584e29d593eb57518607df92edc1af09f0fdd8)
2022-03-18 09:09:25,524 Found 2 citations for tools or databases
2022-03-18 09:09:31,490 Query 1/1: P9P10P11P12_unpaired_a961f (length 112)
2022-03-18 09:09:31,492 Could not generate input features P9P10P11P12_unpaired_a961f: 'NoneType' object is not subscriptable
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/colabfold/batch.py", line 1141, in run
    model_type,
  File "/usr/local/lib/python3.7/dist-packages/colabfold/batch.py", line 839, in generate_input_feature
    paired_msa[sequence_index]
TypeError: 'NoneType' object is not subscriptable
2022-03-18 09:09:31,493 Done

PS: the paired mode also seems to be paired+unpaired

Start in colabfold/batch.py at generate_input_feature, especially the reported line 839 where paired_msa is indexed. Reproduce the issue with the supplied sequence using MSA_Mode single and pair_mode unpaired, then verify that the run returns a structure without the NoneType error.