Mike McQuaid 9b8c30e0c8 compat/extend/string: fix odisabled return.
`odisabled` will still return for a formula in `.brew`. This means
`EOS.undent` returns `nil` and the formula cannot be parsed. Instead
return the actual string in this case to avoid e.g. patches blowing up
with `nil` strings.

Fixes #4049.
2018-04-11 16:16:30 -07:00
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