fastq_dir cannot be a symlink

[nathanweeks]

Description of the bug

If a fastq_dir specified in the --input sample sheet is a symbolic link to a directory instead of a directory, then a "No fastq_dir specified or no samples found in folder." error results.

Command used and terminal output

$ export NXF_HOME=$PWD/nextflow
$ nextflow run nf-core/spatialvi -r dev \
  -profile singularity \
  --input samplesheet.csv \
  --outdir outdir \
  --publish_dir_mode link
...
[-        ] NFC…E_SPATIALVI:SPATIALVI:MULTIQC -
No `fastq_dir` specified or no samples found in folder.
ERROR ~ Pipeline failed. Please refer to troubleshooting docs: https://nf-co.re/docs/usage/troubleshooting

Relevant files

No response

System information

No response

[nathanweeks]

I think I have a simple fix; working through the process of testing/submitting a PR.