Error Handling for Cache

[bmcecilia3]

Description of changes:

• Catch cache errors and prevent them from causing problems in the health calls

Description of testing:

• Tested on T9401REG0070 to verify that health calls and health status calls work and for device functionality
• Tested on T9401REG0066 to verify that health calls and health status calls work and for device functionality
• Tested on T9401REG0178 to verify that health calls and health status calls work and for device functionality

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)

[CLAassistant]

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