tree dfbb13c6d56d4f3c7fde04853528aa87f068176a
parent e305e48bee2ce1854becf77c56f0b16a57b5772a
author rjorgenson <rjorgenson@gmail.com> 1322635525 -0700
committer rjorgenson <rjorgenson@gmail.com> 1322635525 -0700

added error suppression to tree alias

the $(which tree) check general.aliases would ouput an error if the
    command was not found. Added suppression of that error.