Fixed a bug that SLRP would fail if the state files do not exist.
Fixed a bug that SLRP would fail if the state files do not exist.

Review: https://reviews.apache.org/r/64756/

dforsyth/mesos,dforsyth/mesos,abudnik/mesos,gsantovena/mesos,andschwa/mesos,kaysoky/mesos,Gilbert88/mesos,abudnik/mesos,andschwa/mesos,abudnik/mesos,gsantovena/mesos,chhsia0/mesos,reneploetz/mesos,jpeach/mesos,Gilbert88/mesos,reneploetz/mesos,chhsia0/mesos,abudnik/mesos,Gilbert88/mesos,andschwa/mesos,gsantovena/mesos,dforsyth/mesos,asamerh4/mesos,kaysoky/mesos,gsantovena/mesos,dforsyth/mesos,Gilbert88/mesos,jpeach/mesos,dforsyth/mesos,Gilbert88/mesos,dforsyth/mesos,chhsia0/mesos,asamerh4/mesos,abudnik/mesos,gsantovena/mesos,asamerh4/mesos,reneploetz/mesos,abudnik/mesos,chhsia0/mesos,asamerh4/mesos,gsantovena/mesos,asamerh4/mesos,chhsia0/mesos,andschwa/mesos,dforsyth/mesos,kaysoky/mesos,gsantovena/mesos,asamerh4/mesos,reneploetz/mesos,andschwa/mesos,andschwa/mesos,reneploetz/mesos,Gilbert88/mesos,jpeach/mesos,kaysoky/mesos,asamerh4/mesos,abudnik/mesos,reneploetz/mesos,jpeach/mesos,jpeach/mesos,Gilbert88/mesos,jpeach/mesos,reneploetz/mesos,andschwa/mesos,chhsia0/mesos,kaysoky/mesos,chhsia0/mesos,kaysoky/mesos,kaysoky/mesos,jpeach/mesos