fix(macos): check WKURLSchemeTask is valid before using #1282
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Ref: tauri-apps/tauri#9933 #1142 #1189
task
in async mode may become invalid at any moment when webview decides to stop the task.It could happen in any section of the responder, so we need to record which task is valid and check before we use it in the response callback.
One of my concerns is there might be a small chance that the task becomes invalid after we check it and before using it.