Fixed a crash on Linux systems introduced in version 1.9.14 when running a command with a NULL argv[0] if log_subcmds or intercept is enabled in sudoers.

Fixed a problem with "stair-stepped" output when piping or redirecting the output of a sudo command that takes user input when running a command in a pseudo-terminal.

Fixed a bug introduced in sudo 1.9.14 that affects matching sudoers rules containing a Runas_Spec with an empty Runas user. These rules should only match when sudo's -g option is used but were matching even without the -g option. GitHub issue #290.