The plugin was crashing with Cannot read properties of undefined (reading 'includes') when used with Yale Assure Lock 2 devices. The issue occurred because the lock's API response contains a lockStatus object like {"status":"unknown"} without a doorState property, but the code assumed this property would always exist.

The crash happened in the parseStatus method when trying to call .includes() on the undefined doorState:

// This would crash when doorState is undefined
this.lockStatus.doorState.includes('open')
this.lockStatus.doorState.includes('closed')

The fix adds optional chaining to safely handle cases where doorState is undefined:

// Safe version that returns undefined instead of crashing
this.lockStatus.doorState?.includes('open')
this.lockStatus.doorState?.includes('closed')

This minimal change:

• Prevents the crash by gracefully handling undefined doorState
• Maintains backward compatibility for locks that do provide doorState
• Preserves all existing functionality and logic flow
• Allows the plugin to continue reading battery status and other lock information

The contact sensor functionality will fall back to the existing ContactSensorState when doorState is unavailable, ensuring the plugin remains functional even without door state information.

Fixes #127.

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