added better comments to address issue 1033

VERSION

@@ -1 +1 @@
-Version 2.0.9 (2012-09-27 15:12:31) stable
+Version 2.0.9 (2012-09-27 21:45:13) stable

gluon/sqlhtml.py

@@ -379,8 +379,7 @@ class CheckboxesWidget(OptionsWidget):
         requires = field.requires
         if not isinstance(requires, (list, tuple)):
             requires = [requires]
-        if requires:
+        if requires and hasattr(requires[0], 'options'):
-            if hasattr(requires[0], 'options'):
             options = requires[0].options()
         else:
             raise SyntaxError, 'widget cannot determine options of %s' \