scrnaseq.nf failure with engine error 'NFCORE_SCRNASEQ:SCRNASEQ:MULTIQC'

[YinCai2796]

run failed after completing mtx_conversion and while starting multiqc with the following engine error:
Error executing process > 'NFCORE_SCRNASEQ:SCRNASEQ:MULTIQC'
Not a valid path value type: org.codehaus.groovy.runtime.NullObject (null)
for example data from HealthOmics R2R workflow.

Deleting Line 214 in scrnaseq.nf did work.
https://github.com/aws-samples/amazon-omics-tutorials/blob/main/example-workflows/nf-core/workflows/scrnaseq/workflows/scrnaseq.nf#L214