Fix: size display for dirs with spaces in the name

[Prajjwal]

DirSize requests for dirs with a space in the name contain a urlencoded name (eg. { DirSize: "/hello%20world" }), leading to a 400 Bad Request. The frontend then injects the error response body directly into the page.

1. Handle failures by returning a default string if this request fails.
2. Decode the payload before the request is issued.

Before:

After, upon request failure:

After, with uridecoded payloads:

Notes

• Decoding this on the server along with a test is probably a better way of doing this.

[svenstaro]

Hey, thanks for this. I went ahead and fixed this in the backend so now we can either take percent-encoded paths or plain paths. I used your line of code for JS-side error handling.