fix local build of flow-parser-bin
fix local build of flow-parser-bin

Summary: this wasn't working because when the condition was falsy, the test exiting non-zero not only short circuits the && but also kills the build. so we need it to exit code 0 for a cache hit.

Reviewed By: panagosg7

Differential Revision: D7528520

fbshipit-source-id: a9525e1326f01e87731dc4f4f237e631d21860fc

gabelevi/flow,JonathanUsername/flow,claudiopro/flow,popham/flow,JonathanUsername/flow,jamesgpearce/flow,jamesgpearce/flow,facebook/flow,mroch/flow,facebook/flow,nmote/flow,samwgoldman/flow,jamesgpearce/flow,mroch/flow,JonathanUsername/flow,samwgoldman/flow,samwgoldman/flow,AgentME/flow,gabelevi/flow,jamesgpearce/flow,facebook/flow,JonathanUsername/flow,gabelevi/flow,nmote/flow,gabelevi/flow,mroch/flow,JonathanUsername/flow,nmote/flow,samwgoldman/flow,mroch/flow,facebook/flow,gabelevi/flow,popham/flow,popham/flow,popham/flow,nmote/flow,AgentME/flow,AgentME/flow,nmote/flow,facebook/flow,gabelevi/flow,samwgoldman/flow,mroch/flow,AgentME/flow,JonathanUsername/flow,claudiopro/flow,popham/flow,JonathanUsername/flow,mroch/flow,claudiopro/flow,facebook/flow,jamesgpearce/flow,samwgoldman/flow,claudiopro/flow,mroch/flow,nmote/flow,jamesgpearce/flow,samwgoldman/flow,popham/flow,claudiopro/flow,AgentME/flow,jamesgpearce/flow,nmote/flow,popham/flow,facebook/flow,gabelevi/flow