fix lint

datarequest.py

@@ -1896,7 +1896,7 @@ def api_datarequest_dta_post_upload_actions(ctx: rule.Context, request_id: str,
     :param request_id: Unique identifier of the data request
     :param filename:   Filename of DTA
 
-    :returns:
+    :returns: API result
     """
     # Permission check
     datarequest_action_permitted(ctx, request_id, ["DM"], [status.APPROVED,
@@ -1941,7 +1941,7 @@ def api_datarequest_signed_dta_upload_permission(ctx: rule.Context, request_id:
     :param action:     String specifying whether write permission must be granted ("grant") or
                        revoked ("revoke")
 
-    :returns:
+    :returns: API result
     """
     # Permission check
     datarequest_action_permitted(ctx, request_id, ["OWN"], [status.DTA_READY])
@@ -1953,7 +1953,7 @@ def api_datarequest_signed_dta_upload_permission(ctx: rule.Context, request_id:
     # Grant/revoke temporary write permissions
     dta_coll_path = "/{}/{}/{}/{}".format(user.zone(ctx), DRCOLLECTION, request_id, SIGDTA_PATHNAME)
     ctx.adminTempWritePermission(dta_coll_path, action)
-
+    return None
 
 @api.make()
 def api_datarequest_signed_dta_post_upload_actions(ctx: rule.Context, request_id: str, filename: str) -> api.Result:
@@ -1977,6 +1977,7 @@ def api_datarequest_signed_dta_post_upload_actions(ctx: rule.Context, request_id
 
     # Set status to dta_signed
     status_set(ctx, request_id, status.DTA_SIGNED)
+    return None
 
 
 @api.make()