V17: Save and preview without a name

[kjac]

Which Umbraco version are you using?

V17 RC (built from source), but I think this also affects V16

Bug summary

Save and preview can be invoked for documents without a name, leading to various error states depending on the document variance.

Specifics

For invariant documents you'll get a "Content type culture variance mismatch" error:

save-and-preview-1.webm

For variant documents you'll get an "Unknown error. Please see the log for more details." error when invoking immediately after creation:

save-and-preview-2.webm

For a new variant of an existing variant document, Save and preview seemingly succeeds, and the preview window is even opened - but the variant is of course not saved, because it has no name:

save-and-preview-3.webm

Steps to reproduce

See screencasts above.

Expected result / actual result

The Save and preview button should be disabled until a name has been entered - same as the Save button.

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This item has been added to our backlog AB#61203