Immediate no results in structural search

Created by: sqs

Repro:

1. Go to https://sourcegraph.com/search?q=repo:github.com/sourcegraph/sourcegraph+%22New%28:%5Bargs%5D%29.:%5Bimmcall%5D%28%22+lang:go&patternType=structural

Expected: see some results (clicking "Show more" does result in results being shown fairly quickly) Actual: immediate empty search results page with "Show more" button

Also, it is unexpected that it says "No results" definitively but also shows "Show more".