Fix tsp-openapi3 to emit valid @tagMetadata for tags without descriptions

packages/openapi3/src/cli/actions/convert/generators/generate-tags.ts

@@ -24,7 +24,7 @@ export function generateTags(tags: TypeSpecTagMetadata[]): string {
     const tagMetadata =
       description || externalDocs
         ? `, #{${[description, externalDocs].filter((x) => !!x).join(", ")}}`
-        : "";
+        : ", #{}";
     return `@tagMetadata("${tag.name}"${tagMetadata})`;
   });
 

packages/openapi3/test/tsp-openapi3/output/playground-http-service/main.tsp

@@ -7,7 +7,7 @@ using OpenAPI;
 
 @service(#{ title: "Widget Service" })
 @info(#{ version: "0.0.0" })
-@tagMetadata("Widgets")
+@tagMetadata("Widgets", #{})
 namespace WidgetService;
 
 model Error {

packages/openapi3/test/tsp-openapi3/output/tag-without-description/main.tsp

@@ -0,0 +1,20 @@
+import "@typespec/http";
+import "@typespec/openapi";
+import "@typespec/openapi3";
+
+using Http;
+using OpenAPI;
+
+@service(#{ title: "(title)" })
+@info(#{ version: "0.0.0" })
+@tagMetadata("consents", #{})
+namespace title;
+
+model Consent {
+  id: string;
+}
+
+@tag("consents")
+@route("/")
+@get
+op getConsent(): Consent;

packages/openapi3/test/tsp-openapi3/specs/tag-without-description/service.yml

@@ -0,0 +1,29 @@
+openapi: 3.0.0
+info:
+  title: (title)
+  version: 0.0.0
+tags:
+  - name: consents
+paths:
+  /:
+    get:
+      operationId: getConsent
+      parameters: []
+      responses:
+        "200":
+          description: The request has succeeded.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Consent"
+      tags:
+        - consents
+components:
+  schemas:
+    Consent:
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: string