Request parameters not available in templates

[raphael-m]

I have a template containing the following element (some attributes and child nodes left out to keep it simple):

<pb-table-grid source="api/locality/${key}" ... data-template="pages:parse-params">                        
    ...
</pb-table-grid>

If I understand it correctly, ${key} should be replaced with the key request parameter defined in our custom-api.json. But it seems key in the model passed to pages:parse-params is always empty.

I could narrow down the issue to be caused by this change: e76aa6d. If I uncomment the corresponding line, ${key} is populated correctly.

What was the reason for that change - is it save to uncomment the line again, or is there another solution?