Ryan Ernst 88cf8ac0a8 Fix windows empty line in logging capture (#52162)
This commit fixes another edge case in handling windows newlines in our
capture of stdout/stderr to log4j. The case is that the \r appears at
the beginning of the buffer when flushing, which would unintentionally
be emitted as an empty string. This commit skips the flush if only a \r
was found.

closes #51838
2020-02-10 13:29:50 -08:00
..