fixed an issue with lack of validators in 'double' type

gluon/dal.py

@@ -10261,8 +10261,10 @@ class Field(Expression):
 
     def formatter(self, value):
         requires = self.requires
-        if value is None or not requires:
-            return value or self.map_none
+        if value is None:
+            return self.map_none
+        if not requires:
+            return value
         if not isinstance(requires, (list, tuple)):
             requires = [requires]
         elif isinstance(requires, tuple):

gluon/html.py

@@ -1863,6 +1863,7 @@ class INPUT(DIV):
             t = self['_type'] = 'text'
         t = t.lower()
         value = self['value']
+
         if self['_value'] is None or isinstance(self['_value'],cgi.FieldStorage):
             _value = None
         else:

gluon/sqlhtml.py

@@ -1140,12 +1140,12 @@ class SQLFORM(FORM):
                 default = field.default
                 if isinstance(default, CALLABLETYPES):
                     default = default()
-
             cond = readonly or \
                 (not ignore_rw and not field.writable and field.readable)
 
-            if default is not None and not cond:
+            if default is not None and not cond:                
                 default = field.formatter(default)
+
             dspval = default
             inpval = default
 
@@ -1599,7 +1599,6 @@ class SQLFORM(FORM):
                 fields[fieldname] = self.vars[fieldname]
 
         if dbio:
-            print fields
             for fieldname in fields:
                 if fieldname in self.extra_fields:
                     del fields[fieldname]