How to tell the Embedded Coder to not write zero to unconnected output ports

Hi,

I am using a Mux block in Simulink with 32 ports to create a bus signal with the storage class set to ImportedExternPointer. I would like to generate code from this signal so that the connected signals of the Mux block are written over pointers to memory. However, if I do not connect all the ports of the mux block, in my generated code the value 0 will be written to memory. Can I avoid this somehow? Can the Embedded Coder ignore the unconnected ports of the Mux in Simulink?

Thanks!