When passing a null value as parameter (ex.: 0, None or False), Sanic said "Error: Required parameter `param` was not passed to url_for"
Example:
```
@app.route("/<idx>")
def route(rq, idx):
pass
```
```
url_for("route", idx=0)
```
No longer raises: `Error: Required parameter `idx` was not passed to url_for`