Basic code intel: URL encoding/decoding bug on files with spaces and parentheses

Created by: chrismwendt

• Visit a file that has spaces and parentheses in it https://sourcegraph.com/github.com/chrismwendt/small-ts-sample/-/blob/space%20%28paren%29thing.ts#L1:1
• Hover over Animal
• Notice errors in the console:

cannot get property "content" of null

I don't yet know if this is an extension or backend issue. Edit: it's an extension bug.

See https://sourcegraph.slack.com/archives/C0B2RU51Q/p1571167036091100 for more context