workflow_fast5: fix to skip multifast5 step if folder exists (config:...

workflow_fast5: fix to skip multifast5 step if folder exists (config: single_fast5_dir is an empty str)

workflow_fast5/Snakefile

@@ -42,7 +42,7 @@ rule all:
 # Single-FAST5 to Multi-FAST5
 rule create_multifast5s:
     input:
-        SINGLE_FAST5_DIR
+        ancient(SINGLE_FAST5_DIR) if config["single_fast5_dir"] == "" else SINGLE_FAST5_DIR
     output:
         protected(directory(MULTI_FAST5_DIR))
     log: