Fix a bug that cause local test helper to fail when searching an emulator with an older cloud SDK

[aozarov]

currentVersion may be null when using an older GCLOUD SDK without the searched emulator.

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[garrettjonesgoogle]

/cc @shinfan

[garrettjonesgoogle]

That's odd that googlebot doesn't recognize your CLA status...

[googlebot]

CLAs look good, thanks!

[aozarov]

That's odd that googlebot doesn't recognize your CLA status...

I created this PR directly via the Github UI which used, aozarov@users.noreply.github.com, as the Author. I fixed that by amending the commit.

[aozarov]

ping.

Was this issue fixed in a different PR? We need to get it in for fixing the gcloud-java pubsub-alpha branch build.

[shinfan]

LGTM. Thanks for catching & fixing the issue.

[aozarov]

I don't have permission to merge for this repository.
I built it locally and it looks fine. Do you mind to merge and create a new release with this fix?

BTW, I highly recommend configuring Travis for this project to build every PR, so you can be sure
that it builds before you merge.