pgfunction.js fails with call to get_schema.sql

[stryker-m]

All method requests throw an error. The call to schema query should pass a method name as parameter. Function also needs a rewrite to chain subsequent calls on the schema query result. @SimonGoring, do you have a different version that works locally? All the July 23 commits have the same problem. I'm reverting tilia-dev to use last working instance of app.