Github user PascalSchumacher commented on the pull request:
https://github.com/apache/commons-lang/pull/113#issuecomment-172357021
@hen Thanks again for the in-depth review.
Part of the is `isEmpty()` is necessary, because `normalizeSpace` has to
return `null` for `null` parameters according to javadoc `@return the modified
string with whitespace normalized, {@code null} if null String input`
I have updated the pull request and replaced the is `isEmpty()` check by
`str == null`.
I have also updated javadoc to reflect that non-breaking space is
normalized.
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