Maybe have a look at the solution proposed here: 
https://groups.google.com/forum/#!topic/web2py/ckZlkLVx-hc

On Tuesday, October 14, 2014 2:53:13 PM UTC-4, max wrote:
>
>
> i see everywhere, there is none returned in the ,   SQLFORM.grid when 
> there is no value in the table. is there a way to globally disable this. i 
> can  do a dom manipulation using a jquery function, which is not very 
> clean. has somebody any idea.
> thanks for any advice.
> dulip
>
>

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