make this more flexible

Author: mr-c

cwltool/workflow.py

@@ -338,7 +338,7 @@ def receive_output(self, step, outputparms, final_output_callback, jobout, proce
     def try_make_job(self, step, final_output_callback, **kwargs):
         # type: (WorkflowJobStep, Callable[[Any, Any], Any], bool, bool, **Any) -> Generator
 
-        js_console = kwargs["js_console"] or False
+        js_console = kwargs.get("js_console", False)
         debug = kwargs["debug"] or False
 
         inputparms = step.tool["inputs"]