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If variable is set to empty string the comparison is "if [ -eq 1 ]" which fails with "[: -eq: unary operator expected". (From OE-Core rev: 5bbafa99ec76a197e433ae3fb1ee44da7be398a5) Signed-off-by: Tomasz Dziendzielski <tomasz.dziendzielski@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> (cherry picked from commit 36a2dc83fd0e1d6e2b8441e24a4cbc48a6c4fc19) Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>