fixes #978, autotypes and unicode strings, thanks remcoboerma

gluon/sqlhtml.py

@@ -1691,6 +1691,7 @@ class SQLFORM(FORM):
 
     AUTOTYPES = {
         type(''): ('string', None),
+        type(u''): ('string',None),
         type(True): ('boolean', None),
         type(1): ('integer', IS_INT_IN_RANGE(-1e12, +1e12)),
         type(1.0): ('double', IS_FLOAT_IN_RANGE()),