Ignore errors of loading before completions initialized

[AlmogBaku]

This PR fixes the issue I encountered on #285

It simply ignores the error of loading this script before the compinit.

[ahmetb]

Is this pretty standard in comp scripts in zsh?

[AlmogBaku]

I dunno, I saw it on another project that had the same issue...

[ahmetb]

It would be good to research as it actually works fine for most people. Adding something we don't understand the consequences fully is going to create a problem in the future, especially if this bug happens because how things are set up for a small amount of people.