Hash router adds second # if url ends with a #.

[birkskyum]

This bug was surfaced by the Vitest PR here:

• Replace Jest with Vitest 2 #4728

If there is a url ending with an empty hash like: http://localhost/#

Then the hash router would add a secondary hash when initializing, resulting in this:

http://localhost/##3/0/0

Repro:

• We don't have a hash router example yet ( hash-router example #4731 ), so go to any example, like the cluster.html and enable hash:true
• Go to http://localhost:9966/test/examples/cluster.html#
• Resulthttp://localhost:9966/test/examples/cluster.html##3/40.67/-103.59