fix: panic when device is missing CardName or SerialNumber

[ajcasagrande]

See: https://github.com/orgs/edgexfoundry/discussions/129

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[lenny-goodell]

@ajcasagrande , please fix on main (not minnesota since there is a work around) and create a BUG issue for it and list it here: https://wiki.edgexfoundry.org/display/FA/Minnesota#Minnesota-KnownBugs

[presatish]

It would be helpful if examples under https://github.com/EdgeX-Camera-Management/device-usb-camera/blob/fix-discover-panic/cmd/res/devices are updated too. There is no CardName here.

Yes, and not just in the Example App, also here in this repo. https://github.com/edgexfoundry/device-usb-camera/blob/main/cmd/res/devices/general.usb.camera.yaml.example https://github.com/edgexfoundry/device-usb-camera/blob/main/cmd/res/devices/hp.w200.yaml.example

@ajcasagrande , please fix these as part of this PR. THX!

@lenny-intel After looking into the issue more I don't think cardName and serialNumber need to be included in the examples. They are not the required parameters, they can be used if additional checking is required. Initially when I posted my comment I thought they are the required parameters.