T032: ClustalO web service requires email address

[dominiquesydow]

This discussion is meant to document some decision-making in T032 and is linked in the respective notebook.

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In T032, we use the ClustalO web service to align multiple sequences. In order to use the service, we need to provide an email address (see the docs).

Since we cannot know in what way TeachOpenCADD is used (imagine a class of 50 students might run this notebook at the same time), we should not provide an email address here; we risk being banned from their web service. Instead, we will set the email by default to None and use pre-calculated alignments.

Big disadvantage: The ClustalO query will not be covered by our CI.

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If someone comes up with a more elegant way, please let us know :)