Fix isort to run `./pants fmt.isort` once.

Review Request #4297 - Created Oct. 12, 2016 and submitted

Information
John Sirois
pants
jsirois/isort/speed-up
3951
dcabb10...
Reviewers
pants-reviews
kwlzn, wisechengyi
This change preserves the skip-fast behavior of the `xargs -I` approach
when there are no targets with changed files.

 build-support/bin/isort.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
Local testing with both no changed targets and several while
peeking at `./pants server` activity.

CI went green here:
  https://travis-ci.org/pantsbuild/pants/builds/167073385
John Sirois
Kris Wilson
John Sirois
Review request changed

Status: Closed (submitted)

Change Summary:

Now on master:

git log -1 origin/master
commit aff5278af64cf6473cd599d0cec2137a173b12c7
Author: John Sirois <john.sirois@gmail.com>
Date:   Wed Oct 12 12:05:11 2016 -0600

    Fix isort to run `./pants fmt.isort` once.
    
    This change preserves the skip-fast behavior of the `xargs -I` approach
    when there are no targets with changed files.
    
    Testing Done:
    Local testing with both no changed targets and several while
    peeking at `./pants server` activity.
    
    CI went green here:
      https://travis-ci.org/pantsbuild/pants/builds/167073385
    
    Bugs closed: 3951
    
    Reviewed at https://rbcommons.com/s/twitter/r/4297/
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