For some, these short lines add extra white space that enhances the design. In some cases the short line followed by an indented paragraph creates odd patterns in the text. I hope you'll always try to correct is the hyphenated word left sitting at the top or bottom of a column. It's at its worst when the hyphenated word is split between two different pages of the document. It looks bad but it also makes it harder on your reader.
Some software offers tools to help eliminate their occurrence.
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