fix: add Notes schema type

this is because the dict we get from (normalizing the) farmOS API
record will have e.g. `notes=None` but that winds up rendering as
"None" instead of empty string - so we use colander.null value in such
cases so empty string is rendered

src/wuttafarm/web/forms/schema.py

@@ -28,6 +28,7 @@ import json
 import colander
 
 from wuttaweb.forms.schema import ObjectRef, WuttaSet
+from wuttaweb.forms.widgets import NotesWidget
 
 
 class AnimalTypeRef(ObjectRef):
@@ -380,3 +381,25 @@ class LogAssetRefs(WuttaSet):
         from wuttafarm.web.forms.widgets import LogAssetRefsWidget
 
         return LogAssetRefsWidget(self.request, **kwargs)
+
+
+class Notes(colander.String):
+    """
+    Custom schema type for "note" fields.
+    """
+
+    def serialize(self, node, appstruct):
+        """ """
+        if not appstruct:
+            return colander.null
+
+        return super().serialize(node, appstruct)
+
+    def widget_maker(self, **kwargs):
+        """
+        Construct a default widget for the field.
+
+        :returns: Instance of
+           :class:`~wuttaweb.forms.widgets.NotesWidget`.
+        """
+        return NotesWidget(**kwargs)

src/wuttafarm/web/views/farmos/logs.py

@@ -25,7 +25,7 @@ View for farmOS Harvest Logs
 
 from webhelpers2.html import tags
 
-from wuttaweb.forms.schema import WuttaDateTime, WuttaDictEnum, Notes
+from wuttaweb.forms.schema import WuttaDateTime, WuttaDictEnum
 from wuttaweb.forms.widgets import WuttaDateTimeWidget
 
 from wuttafarm.web.views.farmos import FarmOSMasterView
@@ -42,6 +42,7 @@ from wuttafarm.web.forms.schema import (
     FarmOSAssetRefs,
     FarmOSRefs,
     LogQuick,
+    Notes,
 )
 from wuttafarm.web.util import render_quantity_objects