Hardcoded RSEM reference path creates an error, if the Path for other References differs

[fischuu]

MissingInputException in rule rsem_create_index in line 56 of /users/fischerd/git/Snakebite-RNAseq/rules/Step1-Preparations:
Missing input files for rule rsem_create_index:
output: /scratch/project_2002561/MC_is2/Reference/RSEM.chrlist
affected files:
/scratch/project_2002561/MC_is2/Reference