dbIsNetOptical

dbIsNetOptical(
d_netId
)
=> t / nil

Checks whether the specified net or signal has optical data.

d_netId

The database ID of a net.

`t`	The object is a net or a signal that has optical data.
`nil`	The specified net or a signal does not contain optical data.

A warning is displayed if the specified ID is not a valid database ID of a net.

dbIsNetOptical(netID) => t / nil