Removed count fields

Former-commit-id: 445b9938

steps/DP3.PreflaggerStepGenerator.cwl

@@ -21,8 +21,7 @@ inputs:
       .flagstat. The basename of the table is the MS name (without extension)
       followed by the stepname and extension.
   - id: count.path
-    default: ''
-    type: string
+    type: string?
     doc: >-
       The directory where to create the flag percentages table. If empty, the
       path of the input MS is used.