Handle /peripheral endpoint error when bad handscanner connected

[bmcecilia3]

Description of changes:

• Removed logic that assumes that both scanners will be connected at startup

Description of testing:

• Tested in the lab to verify that when the hand scanner is disconnected it does not break the peripherals endpoint
• Tested in the lab to verify that when the flatbed scanner is disconnected it does not break the peripherals endpoint
• Tested in the lab to verify that when both scanners are disconnected it does not break the peripherals endpoint

Please make sure the following changes have been made before creating a pull request.

Update Description

• Change tested on actual device
• Changes tested for simulator
• Existing device functionality is working fine
• Unit Tests Written for Code Changes, and Verified that Coverage is 100% for Modified Files(with the exception of ATM devices)

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