PGAdmin Restore dialog

Hi all,

Thanks for developing this tool, first. I just started using it for Pg10
This is a small issue I experienced:
When I don't enter a number of jobs my DB restore gives the cryptic error message, something like: type bool has no len().
It took me a while to figure out that this param was mandatory. (I don't think leaving it empty showed me the red box on clicking apply.
Maybe a better error message would work?

Cheers,
Jan Pieter Wijbenga
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