Use try-finally to ensure filter_output is unregistered
#278
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Related Issue
Azure/azure-cli#27228
Description
If
query_expression.searchraises an Exception, the following linecli_ctx.unregister_event(EVENT_INVOKER_FILTER_RESULT, filter_output)won't be executed, and the callback with error remains in the_event_handlers.Az Interactive uses the same
cli_ctxfor every command execution, so if there is an exception related to--query, it will keep happening for any subsequent commands.