fixed problem with widget and list:string

VERSION

@@ -1 +1 @@
-Version 2.6.3-stable+timestamp.2013.09.19.21.43.19
+Version 2.6.3-stable+timestamp.2013.09.19.22.02.47

gluon/sqlhtml.py

@@ -292,6 +292,7 @@ class ListWidget(StringWidget):
             _class = 'string'
         requires = field.requires if isinstance(
             field.requires, (IS_NOT_EMPTY, IS_LIST_OF)) else None
+        if isinstance(value,str): value = [value]
         nvalue = value or ['']
         items = [LI(INPUT(_id=_id, _class=_class, _name=_name,
                           value=v, hideerror=k < len(nvalue) - 1,
@@ -1356,8 +1357,6 @@ class SQLFORM(FORM):
                         value = self.record[fieldname]
                     else:
                         value = self.table[fieldname].default
-                    if field.type.startswith('list:') and isinstance(value, str):
-                        value = [value]
                     row_id = '%s_%s%s' % (
                         self.table, fieldname, SQLFORM.ID_ROW_SUFFIX)
                     widget = field.widget(field, value)