Handle thrown illegalStateException when cams are unavailable in CameraXManager

[73k05]

Hi,

when initialising camera hardware and binding, we check if camera are available and the throw exception if not, we can observe it in the following peace of code:

lensFacing = when {
            hasBackCamera() and !options.isFrontFacing -> CameraSelector.LENS_FACING_BACK
            hasFrontCamera() and options.isFrontFacing -> CameraSelector.LENS_FACING_FRONT
            else -> throw IllegalStateException("Back and front camera are unavailable")
        }

The main issue with this code is that this case actually happened on a moto g power (android 11) and the exception is thrown which is well anticipated code. But the exception is not handled and not delegated causing the application to crash. Here is what I propose in the PR:

1. Delegate exception to fragment

@Throws(IllegalStateException::class)
    fun bindCameraUseCases(binding: FragmentPixBinding) {

2. Handle exception in fragment by backpressing and return to the previous view

try {
            setUpCamera(binding)
            binding.gridLayout.controlsLayout.flashButton.show()
            binding.setDrawableIconForFlash(options)
        }catch (e:IllegalStateException){
            resultCallback?.invoke(PixEventCallback.Results())
            PixBus.returnObjects(
                event = PixEventCallback.Results(
                    ArrayList(),
                    PixEventCallback.Status.BACK_PRESSED
                )
            )
        }

Also work for another thrown in the same function.

Regards 73k05

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