cast_shadow unchecked causes crash

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Hi,

I'm using gazebo 1.2.5 in gentoo linux. When I run gazebo with default world and add a cylinder and uncheck the cast_shadow property in somewhere in the link section of the cylinder, it causes gazebo to crash with the following error message:

Exception [Publisher.cc:79] Publishing and uninitialized message on topic[/gazebo/default/model/modify]. Required field [link[0].visual[0].name] missing.

Qt has caught an exception thrown from an event handler. Throwing exceptions from an event handler is not supported in Qt. You must reimplement QApplication::notify() and catch all exceptions there.

terminate called after throwing an instance of 'gazebo::common::Exception'

It happens every time. GDB shows no backtrace.

Thanks.