Not supported connector is always counted as sink connector on the dashboard

[dabr-grapeup]

If connector is not supported one, its type is "", because of that it always counts as sink connector on the dashboard site.

Line to fix:
https://github.com/Landoop/kafka-connect-ui/blob/b5827cbec8cc53737730cdd87051fe05d522fa82/src/factories/supported-connectors.factory.js#L46