[support] foreach error on forms with non-admin user

[Christopher M. Jones]

These aren't errors but warnings, and they generally aren't serious. 
You, or your host, should adjust the php error reporting settings to 
make these go away.

Lluís wrote:
> I have created a site and subsites sharing some tables, and when a
> user with uid!=1 tries to create a node, on top appear a red message
> with:
> warning: Invalid argument supplied for foreach() in
> /home/escolcat/agrupaments/includes/form.inc on line 950.
> 
> Despite this errors nodes are created (don't know if correctly).
> 
> How can I track this error? I know with the provided information is
> impossible to solve it.
> I also use Organic Groups, cant it be because a contrib module?
> 
> thanks
>