I have found out a bug/typo in Kendo 2016.1.226 - in a few places, the variable "toConnector" is misspelled as "toConenctor" (note - one "n" is to the right of the "e").
The type can be found in kendo.dataviz.min.js, kendo.dataviz.diagram.min.js etc. I'm not sure if it causes any noticeable bugs, but I couldn't find info confirming it was fixed.
Regards,
Itai.