fix: fix a crash when a JSObject was finalized after the ExecutingContext was freed. #372
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When opening multiple WebF pages, all WebF pages share a QuickJS runtime and some JSObjects are shared across multiple pages. When the shared JSObjects are finalized by the GC, the owner ExecutionContext could already be freed, and reading them could cause our apps to exit.
This patch checks whether the ExecutionContext is valid before accessing the ExecutionContext's memory.