[Bug] LinkTo do not generates href when @model is defined as undefined

[rogeraraujo90]

🐞 Describe the Bug

When using LinkTo in a component and we want @model to be optional, the href is not being generated if no model is provided.

🔬 Minimal Reproduction

https://gist.github.com/rogeraraujo90/bc68849c7bf81bba7e0127706c690111

😕 Actual Behavior

The href is generated as <current-route>#

🤔 Expected Behavior

The href should be generated correctly to the provided route.

PS: If I remove the @model from the LinkTo component the href is generated correctly in my Ember version. Is not working well on Twiddle.

🌍 Environment

• Ember: 3.28.8
• Node.js/npm: 14.16.1
• OS: Windows
• Browser: Brave (chromium based)

➕ Additional Context

Even though I couldn't fix the problem in the twiddle, in my project I could by removing the @model param in my component. But this is not ideal because since this is a component, I would like to have the possibility to pass a model or not.

Discord discussion: https://discord.com/channels/480462759797063690/483601670685720591/943929878108069978

[locks]

I don't think this is a bug.

Can you write out in code what you mean by "if no model is provided"? Your description seems to disagree with itself, as you say that removing the @model named argument does what you what. Your reproduction doesn't include the router, so we also don't know what dynamic segments the route might be expecting. If you're optionally passing a model to a route that does not have dynamic segments then you will have problems down the line, as a refresh will not have the same behavior as a transition. In this case I would recommend a service to manage the data.