Diann wrapper Snakefile fails on missing irrelevant paramater

[fburic]

Thescripts/quantification/diann.Snakefile script tries to read the diann_library config parameter, even when it is run in normal mode (the parameter is only required for a DIA-NN library-free search). The script crashes if this parameter is not specified in the config file.

Workaround:

Add diann_library: "results/diann/dummy.tsv" to prevent the script from crashing. (The dummy file won't be created.)