Rename selector in parset_selector

steps/DP3.ParsetSelector.cwl

@@ -2,13 +2,15 @@ class: ExpressionTool
 cwlVersion: v1.0
 id: parsetselector
 inputs:
-  - id: selector
+  - id: select_a
     type: boolean
     doc: 'if true selects parset_a, files_a if false selects parset_b files_b'
   - id: a_arguments
-    type: Any
+    type: Any[]
+    default: []
   - id: b_arguments
-    type: Any
+    type: Any[]
+    default: []
 outputs:
   - id: output_arguments
     type: Any

test_jobs/parset_selector.json

 {
-  "selector": true,
+  "select_a": true,
   "a_arguments": {"name": "a"},
   "b_arguments": {"name": "b"}
 }