execute: don't crash if shell is stdout param #20
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If the shell function was passed None or a file descriptor for stdout redirection it would crash since stdout.readline() can't be called. This commit adds an additional check to only print stdout lines from a shell command if stdout is available.
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If the shell function was passed None or a file descriptor for stdout
redirection it would crash since stdout.readline() can't be called.
This commit adds an additional check to only print stdout lines from a
shell command if stdout is available.