Fix an issue that when user is not signed in from inside datalab container last time they use Datalab, then setting PROJECT_NUMBER env var will fail and cause Datalab to not start.
Fix an issue that when user is not signed in from inside datalab
container last time they use Datalab, then setting PROJECT_NUMBER env
var will fail and cause Datalab to not start.

yebrahim/datalab,yebrahim/datalab,craigcitro/datalab,googledatalab/datalab,googledatalab/datalab,yebrahim/datalab,parthea/datalab,googledatalab/datalab,craigcitro/datalab,yebrahim/datalab,craigcitro/datalab,craigcitro/datalab,googledatalab/datalab,parthea/datalab,yebrahim/datalab,parthea/datalab,parthea/datalab,googledatalab/datalab,googledatalab/datalab,craigcitro/datalab,parthea/datalab,parthea/datalab