DX-2286: Fix #4233: Don't overwrite default.site.yml for multisite init #4297
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Motivation
Fixes #4233
Proposed changes
If the URI is not provided (as should only be the case for the default site), don't try to set the URI.
Alternatives considered
Don't mess with the default site at all. Unfortunately the rest of the multisite init command uses the default site as a template, so it must be initialized. Keeping this logic in place is the easiest solution.