[Dor-bl]

🎯 What: Replaced the assert self._cmd statement in AppiumService.is_listening (appium/webdriver/appium_service.py) with an explicit if not self._cmd: check that raises AppiumServiceError.

⚠️ Risk: When Python code is run in optimized mode (python -O), assert statements are stripped out at bytecode compilation time. Leaving assert in production logic allows checks to be bypassed, which could lead to unexpected TypeError or unhandled exceptions when calling dependent methods with None values.

🛡️ Solution: Replaced assert self._cmd with an explicit state validation check that raises AppiumServiceError if self._cmd is empty or uninitialized, and added unit test coverage verifying exception handling.

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PR created automatically by Jules for task 10549833086463993059 started by @Dor-bl

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