[O] Bug: Feature Request: add 'org-babel-before-execute-hook' [8.3.4 (8.3.4-99-ga8e4a3-elpa @ /Users/macbookair/.emacs.d/elpa/org-20160704/)]

[Jiajie Chen]

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Now there exists 'org-babel-after-execute-hook'. I want to implement
this functionality: Check whether the path specified in `:file' exists
in file system and throw an error if that does not exists. If there is
`org-babel-before-execute-hook', we can do that instead of using
advice. I love symmetry :)

Emacs  : GNU Emacs 25.1.50.1 (x86_64-apple-darwin15.5.0, NS appkit-1404.47 
Version 10.11.5 (Build 15F34))
 of 2016-07-03
Package: Org-mode version 8.3.4 (8.3.4-99-ga8e4a3-elpa @ 
/Users/macbookair/.emacs.d/elpa/org-20160704/)