Enable shell completion without set aliases
Enable shell completion without set aliases

Summary:
Otherwise it says after hitting Tab everytime:

> Warning:  Invalid argument supplied for foreach() in arcanist/src/workflow/shell-complete/ArcanistShellCompleteWorkflow.php on line 99

Test Plan: arc h<Tab>

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1766

phacility/arcanist,zhihu/arcanist,eSpark/arcanist,calblueprint/arcanist,dguo-coursera/arcanist,julkiewicz/arcanist,Symplicity/arcanist,PageUpPeopleOrg/arcanist-patches,jra3/arcanist,alexmv/arcanist,Symplicity/arcanist,codelabs-ch/arcanist,folsom-labs/arcanist,julkiewicz/arcanist,calblueprint/arcanist,phacility/arcanist,eSpark/arcanist,calblueprint/arcanist,phacility/arcanist,hach-que/arcanist,uber/arcanist,kevinseelbach/arcanist,aik099/arcanist,memsql/arcanist,sneakpeeq/arcanist,KieranHayes/arcanist,codelabs-ch/arcanist,memsql/arcanist,wxstars/arcanist,sneakpeeq/arcanist,alexmv/arcanist,coursera/arcanist,PageUpPeopleOrg/arcanist-patches,jra3/arcanist,hach-que/arcanist,aik099/arcanist,coursera/arcanist,folsom-labs/arcanist,codelabs-ch/arcanist,alexmv/arcanist,eSpark/arcanist,haskell-infra/arcanist,zhihu/arcanist,folsom-labs/arcanist,chundongwang/arcanist,dguo-coursera/arcanist,Khan/arcanist,aik099/arcanist,memsql/arcanist,wikimedia/phabricator-arcanist,fivestars/arcanist,haskell-infra/arcanist,PageUpPeopleOrg/arcanist-patches,wharris/arcanist,kevinseelbach/arcanist,fivestars/arcanist,Khan/arcanist,chundongwang/arcanist,haskell-infra/arcanist,hach-que/arcanist,phacility/arcanist,memsql/arcanist,hach-que/arcanist,uber/arcanist,wikimedia/phabricator-arcanist,wharris/arcanist,codelabs-ch/arcanist,zhihu/arcanist,julkiewicz/arcanist,KieranHayes/arcanist,wxstars/arcanist,folsom-labs/arcanist,eSpark/arcanist,Khan/arcanist,chundongwang/arcanist,KieranHayes/arcanist,codelabs-ch/arcanist,kevinseelbach/arcanist,sneakpeeq/arcanist,zhihu/arcanist,r4nt/arcanist,phacility/arcanist,uber/arcanist,calblueprint/arcanist,KieranHayes/arcanist,kevinseelbach/arcanist,wharris/arcanist,r4nt/arcanist,aik099/arcanist,wharris/arcanist,Khan/arcanist,Symplicity/arcanist,r4nt/arcanist,dguo-coursera/arcanist,alexmv/arcanist,fivestars/arcanist,wxstars/arcanist,Symplicity/arcanist,wxstars/arcanist,haskell-infra/arcanist,uber/arcanist,dguo-coursera/arcanist,wikimedia/phabricator-arcanist,coursera/arcanist,wikimedia/phabricator-arcanist,jra3/arcanist,chundongwang/arcanist,jra3/arcanist,sneakpeeq/arcanist,r4nt/arcanist,PageUpPeopleOrg/arcanist-patches,fivestars/arcanist,julkiewicz/arcanist,coursera/arcanist