Improvements to triton handling of `page.getResponseData()`
Improvements to triton handling of `page.getResponseData()`

- Wait on promise resolution.
- Don't try to write an undefined value to response.

doug-wade/react-server,lidawang/react-server,doug-wade/react-server,szhou8813/react-server,redfin/react-server,szhou8813/react-server,emecell/react-server,davidalber/react-server,redfin/react-server,lidawang/react-server,davidalber/react-server,emecell/react-server