fix: Improve error handling in blob operations (#2194)

* add error handling for audio_transcribe

* add error handling for pdf functions

* add eror handling for image functions

* final touch

* restore rename

* update notebook to better reflect our new code change

* return None on error with verbose=False for image functions

* define typing module in udf

* only use local variable

* Refactor code

Author: shuoweil