diff --git a/src/wuttafarm/web/forms/widgets.py b/src/wuttafarm/web/forms/widgets.py
index 5fc9d55..9dcc51f 100644
--- a/src/wuttafarm/web/forms/widgets.py
+++ b/src/wuttafarm/web/forms/widgets.py
@@ -89,6 +89,7 @@ class FarmOSRefWidget(SelectWidget):
         self.route_prefix = route_prefix
 
     def serialize(self, field, cstruct, **kw):
+        """ """
         readonly = kw.get("readonly", self.readonly)
         if readonly:
             if cstruct in (colander.null, None):
@@ -116,6 +117,7 @@ class FarmOSRefsWidget(Widget):
         self.route_prefix = route_prefix
 
     def serialize(self, field, cstruct, **kw):
+        """ """
         readonly = kw.get("readonly", self.readonly)
         if readonly:
             if cstruct in (colander.null, None):
@@ -143,6 +145,7 @@ class FarmOSAssetRefsWidget(Widget):
         self.request = request
 
     def serialize(self, field, cstruct, **kw):
+        """ """
         readonly = kw.get("readonly", self.readonly)
         if readonly:
             if cstruct in (colander.null, None):
@@ -170,6 +173,7 @@ class FarmOSLocationRefsWidget(Widget):
         self.request = request
 
     def serialize(self, field, cstruct, **kw):
+        """ """
         readonly = kw.get("readonly", self.readonly)
         if readonly:
             if cstruct in (colander.null, None):
@@ -194,6 +198,7 @@ class FarmOSQuantityRefsWidget(Widget):
     """
 
     def serialize(self, field, cstruct, **kw):
+        """ """
         readonly = kw.get("readonly", self.readonly)
         if readonly:
             if cstruct in (colander.null, None):
@@ -211,6 +216,7 @@ class FarmOSUnitRefWidget(Widget):
     """
 
     def serialize(self, field, cstruct, **kw):
+        """ """
         readonly = kw.get("readonly", self.readonly)
         if readonly:
             if cstruct in (colander.null, None):