Removed pragma no cover on VideoUrl

Author: pulphix

pydantic_ai_slim/pydantic_ai/models/openai.py

@@ -743,7 +743,7 @@ async def _map_single_item(item: object) -> list[ChatCompletionContentPartParam]
         handled = await OpenAIChatModel._handle_document_url(item)
         if handled is not None:
             return handled
-        if isinstance(item, VideoUrl):  # pragma: no cover
+        if isinstance(item, VideoUrl):
             raise NotImplementedError('VideoUrl is not supported for OpenAI')
         # Fallback: unknown type — return empty parts to avoid type-checker Never error
         return []