Check if the icon is null

[raybooysen]

Fixes #178

[raybooysen]

I don't quite get why this is failing on travis, node is throwing exceptions. I tested it out by downgrading to node 8 and the build works. Will take guidance on what you'd like to do: https://travis-ci.org/Nickersoft/push.js/builds/392980457?utm_source=github_status&utm_medium=notification

[Nickersoft]

First of all, thanks for the PR! Sorry this initially passed under the radar.

Damn.. it's a fairly well-known Node issue that is really recent. Has nothing to do with what you wrote. I think the build is failing on master. I'll look into getting a fix out today.

[raybooysen]

The build passes if you force the node version to 8. I can do that as part of this PR?

[Nickersoft]

@raybooysen Ah yeah, I've recently discovered it's an issue with Node 10. You can force Travis to use the LTS version by updating the correct YAML property. I'd recommend v8.11.3, as I think that's the current LTS.

[raybooysen]

Done, build green

[raybooysen]

Is it possible to have this merged and released?

[Nickersoft]

@raybooysen Sorry! I think I saw your message a few days ago and meant to release and completely forgot. I'll merge it in now and draft a release when I get home.