simplified gene_sets logic

workflows/differentialabundance.nf

@@ -62,6 +62,7 @@ if (params.control_features) { ch_control_features = Channel.of([ exp_meta, file
 def run_gene_set_analysis = params.gsea_run || params.gprofiler2_run
 
 if (run_gene_set_analysis) {
+    ch_gene_sets = Channel.of([])    // For methods that can run without gene sets
     if (params.gene_sets_files) {
         gene_sets_files = params.gene_sets_files.split(",")
         ch_gene_sets = Channel.of(gene_sets_files).map { file(it, checkIfExists: true) }
@@ -73,11 +74,7 @@ if (run_gene_set_analysis) {
     } else if (params.gprofiler2_run) {
         if (!params.gprofiler2_token && !params.gprofiler2_organism) {
             error("To run gprofiler2, please provide a run token, GMT file or organism!")
-        } else {
-            ch_gene_sets = [[]]     // If one of token or organism is provided, make gene_sets empty (nested because of .first() in the gprofiler call)
         }
-    } else {
-        ch_gene_sets = []    // For methods that can run without gene sets
     }
 }