feat(rust): allow add_embedding on create_empty_table (#1754)

Fixes https://github.com/lancedb/lancedb/issues/1750

rust/lancedb/src/connection.rs

@@ -196,22 +196,6 @@ impl<T: IntoArrow> CreateTableBuilder<true, T> {
         };
         Ok((data, builder))
     }
-
-    pub fn add_embedding(mut self, definition: EmbeddingDefinition) -> Result<Self> {
-        // Early verification of the embedding name
-        let embedding_func = self
-            .parent
-            .embedding_registry()
-            .get(&definition.embedding_name)
-            .ok_or_else(|| Error::EmbeddingFunctionNotFound {
-                name: definition.embedding_name.clone(),
-                reason: "No embedding function found in the connection's embedding_registry"
-                    .to_string(),
-            })?;
-
-        self.embeddings.push((definition, embedding_func));
-        Ok(self)
-    }
 }
 
 // Builder methods that only apply when we do not have initial data
@@ -329,6 +313,26 @@ impl<const HAS_DATA: bool, T: IntoArrow> CreateTableBuilder<HAS_DATA, T> {
         };
         self
     }
+
+    /// Add an embedding definition to the table.
+    ///
+    /// The `embedding_name` must match the name of an embedding function that
+    /// was previously registered with the connection's [`EmbeddingRegistry`].
+    pub fn add_embedding(mut self, definition: EmbeddingDefinition) -> Result<Self> {
+        // Early verification of the embedding name
+        let embedding_func = self
+            .parent
+            .embedding_registry()
+            .get(&definition.embedding_name)
+            .ok_or_else(|| Error::EmbeddingFunctionNotFound {
+                name: definition.embedding_name.clone(),
+                reason: "No embedding function found in the connection's embedding_registry"
+                    .to_string(),
+            })?;
+
+        self.embeddings.push((definition, embedding_func));
+        Ok(self)
+    }
 }
 
 #[derive(Clone, Debug)]