text: properly unindent lines that consist of only whitespace
The preceding 'for' loop has already established that all the lines are either unindentable or composed of only blanks. So if now a line cannot be unindented, it means it is fully blank, so it can be simply skipped. This fixes https://savannah.gnu.org/bugs/?51760 . Reported-by:David Lawrence Ramsey <pooka109@gmail.com>
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