lake update silently fails when argument does not exists

[PatrickMassot]

Prerequisites

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Description

Running lake update foo in a project not depending on foo returns no output.

Context

See discussion here.

Steps to Reproduce

1. Create a project with no dependency.
2. run lake update foo.

Expected behavior: [Clear and concise description of what you expect to happen]

Error message: "This project has no dependency named foo".

Actual behavior: [Clear and concise description of what actually happens]

Nothing.

Versions

lean4-4.0.2rc4

Impact

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