Handle failures during progress parsing more gracefully

I propose an option that allows progress parsing failures to be ignored. This way progress parsing can continue in the event of a one-time error that would have otherwise interrupted the parsing thread.

In #302 the progress parsing fails because of an unexpected input ("N/A" instead of a formatted timestamp) in the first progress event. Although #315 fixes this, there can arise other circumstances where parsing can fail. I propose a general solution, to allow these failures to be ignored altogether. In most scenarios the consumer doesn't care if every once in a while an event gets dropped as long as they get notified of the overall progress.

Comienza localizando el punto de entrada del análisis del progreso y la ruta de opciones o configuración que controla el comportamiento del parser. Revisa los fallos descritos en #302 y la corrección en #315; después, reproduce un valor de progreso inesperado de "N/A". Se considera terminado cuando se haya definido y demostrado un comportamiento configurable para ignorar fallos sin interrumpir el análisis del progreso.

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