Fix on IE10

[nicolasraynaud-millevolts]

The props property doesn't seem to be initialized at this point when creating a component, which leads to an error.

[joshwcomeau]

Huh, interesting. Seems odd to be that a variable's instantiation would be browser-specific o_O.

That said, I don't really see any downside to this fix, so if it works... ¯_(ツ)_/¯

I have a couple style nits, but I can just do them as a followup commit. I'll share the commit here, so that if you're interested in contributing again, you'll know a bit more about our conventions.

[nicolasraynaud-millevolts]

Thanks! Right after my PR I've seen that you set lint and styling in the pre-push hook, I'll PR correctly next time ;)

[joshwcomeau]

Yeah, actually I'm surprised the hook didn't take care of the lint issue!

The change was small, just added a comment and fixed the ternary styling.

Thanks again :)