config: add LogoNotFoundError

[carlinmack]

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Description

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Replacing generic error (FileNotFoundError was not imported from anywhere) with custom Invenio error

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[carlinmack]

This removed line isn't on master so I'm confused

https://github.com/carlinmack/invenio-communities/blob/master/invenio_communities/views/communities.py

I removed it as Member isn't used