[BUG] Handle default instance name options

[roleyfoley]

Current Behaviour

When linking to a component with an instance called "default" configured on the linked to component you need to use an empty string "" as the instance Id.

This can be confusing for new users working with hamlet as this is a "secret" trick that you don't know

Expected Behaviour

I can either use the empty string approach or the "default" instance id

Possible Solution

Add handling for either an empty string or a "" default string

Steps to Reproduce

1. Link to a component from another one where the instance id is "default"