add option

src/workflow.py

@@ -237,9 +237,10 @@ class Workflow:
         self.rocrate.initialise()
 
 
-    def initialise(self):
+    def initialise(self, create_rocrate = True):
         self.nextflow_file.initialise()
-        self.initialise_rocrate()
+        if(create_rocrate):
+            self.initialise_rocrate()
 
     def generate_all_graphs(self, render_graphs = True):
         tab_processes_2_remove = []