fix: Possible NPE in initBiDi()

[panchenko]

Change list

Make sure httpClientFactory in AppiumCommandExecutor is not null.

Types of changes

• No changes in production code.
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Details

version 9.5.0, code is like below

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability("webSocketUrl", true);
driver = new AndroidDriver(AppiumClientConfig.defaultConfig().baseUri(URI.create(url)), capabilities);

throws

Exception in thread "main" java.lang.NullPointerException: 
Cannot invoke "org.openqa.selenium.remote.http.HttpClient$Factory.createClient(org.openqa.selenium.remote.http.ClientConfig)"
because the return value of "io.appium.java_client.remote.AppiumCommandExecutor.getHttpClientFactory()" is null
	at io.appium.java_client.AppiumDriver.initBiDi(AppiumDriver.java:423)
	at io.appium.java_client.AppiumDriver.startSession(AppiumDriver.java:344)
	at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:173)
	at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:101)
	at io.appium.java_client.AppiumDriver.<init>(AppiumDriver.java:109)
	at io.appium.java_client.android.AndroidDriver.<init>(AndroidDriver.java:223)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: panchenko / name: Alex Panchenko (ece0c2e, 8feb425, a942d67, 3ff2053)

[mykola-mokhnach]

Could you please address checkstyle issues: https://github.com/appium/java-client/actions/runs/16846955387/job/47729343352?pr=2325#step:6:436 ?

[KazuCocoa]

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