(I did grab interval files to be able to move forward) Bug report: If skip_tools includes 'fastqc', workflow fails with error:

ERROR ~ No such variable: fastqc_report

 -- Check script '/Users/dkolbe/.nextflow/assets/nf-core/raredisease/workflows/raredisease.nf' at line: 914 or see [...]

This code section is collating results for MultiQC. The variable fastqc_report is defined earlier only inside the block protected by the skip_tools check.