Update Neousys available configs detection

[j-c-cook]

The modification ensures that the Neousys interface's method '_detect_available_configs' function checks if NEOUSYS_CANLIB is None. If it's None, no configuration is returned, and if it's not, the usual configuration with the interface as 'neousys' and channel as 0 is returned. This provides an additional layer of error handling.

closes #1738

[j-c-cook]

The change above will stop the can.detect_available_configs() function from returning the neousys interface as an option if the driver is unavailable.

Unfortunately, the detection does not query the hardware for an available channel. However, if someone does construct a neousys bus and has the driver available, then there is a couple statements that will handle the improper mounting of the hardware.

python-can/can/interfaces/neousys/neousys.py

Lines 170 to 176 in d40915c

	if (
	NEOUSYS_CANLIB.CAN_Setup(
	channel, byref(self.init_config), sizeof(self.init_config)
	)
	== 0
	):
	raise CanInitializationError("Neousys CAN bus Setup Error")

python-can/can/interfaces/neousys/neousys.py

Lines 178 to 179 in d40915c

	if NEOUSYS_CANLIB.CAN_Start(channel) == 0:
	raise CanInitializationError("Neousys CAN bus Start Error")

@zariiii9003 Would you like a deeper dive into this topic or is 4e2bb4b an adequate fix to #1738?

[zariiii9003]

Looks good, It's still a draft, can i merge?

[j-c-cook]

Looks good, It's still a draft, can i merge?

Removed draft indication. Yes, I think merging is appropriate.