OutputPlots.R: Hardcoded top_genes = 100 produces NAs and causes an exception if basis has less than 100 genes

[almdudleer]

Exception in line 175:
https://github.com/aladyeva-wustl/docker_linseed_snakemake/blob/a1fe794dcafeb3d72596e4b661b35388e4298dea/app/scripts/OutputPlots.R#L175