fixed issue 1262, table.insert() empty, thanks Alan

VERSION

@@ -1 +1 @@
-Version 2.4.1-alpha.2+timestamp.2013.01.09.09.16.07
+Version 2.4.1-alpha.2+timestamp.2013.01.09.10.17.54

gluon/dal.py

@@ -8044,10 +8044,21 @@ class Table(object):
                         raise RuntimeError("Unable to handle upload")
                     fields[field.name] = new_name
 
+    def _defaults(self, fields):
+        "If there are no fields/values specified, return table defaults"
+        if not fields:
+            fields = {}
+            for field in self:
+                if field.type != "id":
+                    fields[field.name] = field.default
+        return fields
+
     def _insert(self, **fields):
+        fields = self._default(fields)
         return self._db._adapter._insert(self, self._listify(fields))
 
     def insert(self, **fields):
+        fields = self._defaults(fields)
         self._attempt_upload(fields)
         if any(f(fields) for f in self._before_insert): return 0
         ret =  self._db._adapter.insert(self, self._listify(fields))