Removed __traits_version__ from json files

Created by: jjenthought

The workflow is a dictionary which contains lists of dictionaries, so only the traits_version keys in the top level dict were being removed. This changed the function so it should do it recursively. It seems fine but the only test is a on a single hardcoded example at the minute. Refs. issue https://github.com/force-h2020/force-bdss/issues/134

Fixes #134 (closed)

force_bdss/io/workflow_writer.py

@@ -95,12 +95,12 @@ def traits_to_dict(traits_obj):
 
     state = traits_obj.__getstate__()
 
-    state = pop_recursive(state,'__traits_version__')
+    state = pop_recursive(state, '__traits_version__')
 
     return state
 
 
-def pop_recursive(dictionary,remove_key):
+def pop_recursive(dictionary, remove_key):
     """Recursively remove a named key from dictionary and any contained
     dictionaries."""
     try: