Description

Prevents file input from being cleared when an error occurs while processing the file
Fixes a bug that prevents the fetch request from being sent when a "Bored waiting" button can't be found.

Closes #

Checklist

• I have read the Contribution Guidelines
• I have performed a self-review of my own code
• I have attached images of the change if it is UI based
• I have commented my code, particularly in hard-to-understand areas
• If my code has heavily changed functionality I have updated relevant docs on Stirling-PDFs doc repo
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