Merge #4500

4500: Don't display dimensions as 0 when it is not set r=ManyTheFish a=dureuill

Fixes regression in embedders where `dimensions: 0` was displayed when it hadn't be set for the `openAi` source.

Was breaking a PHP SDK integration test: cbaecb8c55/tests/Settings/EmbeddersTest.php (L28)

Co-authored-by: Louis Dureuil <louis@meilisearch.com>

milli/src/vector/settings.rs

@@ -199,7 +199,7 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
                 model: Setting::Set(options.embedding_model.name().to_owned()),
                 revision: Setting::NotSet,
                 api_key: options.api_key.map(Setting::Set).unwrap_or_default(),
-                dimensions: Setting::Set(options.dimensions.unwrap_or_default()),
+                dimensions: options.dimensions.map(Setting::Set).unwrap_or_default(),
                 document_template: Setting::Set(prompt.template),
             },
             super::EmbedderOptions::Ollama(options) => Self {