[Process] Do not redirect output to file handles when output is disabled
bug #11121 [2.5][Process] Do not redirect output to file handles when output is disabled, simply discard it (romainneutron)

This PR was merged into the 2.5 branch.

Discussion
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[2.5][Process] Do not redirect output to file handles when output is disabled, simply discard it

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT

Commits
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b35250f [Process] Do not redirect output to file handles when output is disabled