I miss remove space after tag - unreadable exception text

[SergXIIIth]

I miss remove space after tag

__.modal-footer_

underscore is showing the spaces

And got exception

Cannot read property '0' of undefined

Would be nice to have more readable exception text.

[jnicklas]

The error messages aren't great. I don't really know why, either. I think we broke something in the parser. jison generates terrible error messages anyway though, even when they work as intended, but they're not supposed to be that bad.