Fixes #1436: extension prevents 'find all references' pop-up from closing through <esc> if it's empty. #1707
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So pretty much the issue is that here, because nothing pops up, vscode doesn't think we're in the "find all references" context, and lets vscodevim capture keystrokes again.
Thus, all we need to is call API calls that close stuff when the user presses
<Esc>
in normal mode. Doesn't seem to have any performance impact, and fixes an annoyance.