Adds e2e baseline SQL test in puppeteer (#160)

* Adds e2e baseline SQL test in puppeteer

* fix lint

* Skip index test

* add to ci

* Stop waiting for server

* Switch to headless mode

* Adds wait-for-server to package.json and uses it in puppeteer CI

* Adds waiton

* top level wait on

* Adds env var to secrets ci.yml

* use existing connection string

* redo tests

* nits and hopefully fix timeout issue

* Fix config file

* try waiting for delete container menu

* Removes statuseval

* Remove unused var

* Slow down and add quotes to selector

* Fix blocking point, remove wait

* Reduce to 50

* Adds database delete stuff

* remove logs, add back waitFors

* Finish container SQL spec test

src/Explorer/Explorer.ts

@@ -1893,6 +1893,9 @@ export default class Explorer {
   }
 
   public findSelectedDatabase(): ViewModels.Database {
+    if (!this.selectedNode()) {
+      return null;
+    }
     if (this.selectedNode().nodeKind === "Database") {
       return _.find(this.databases(), (database: ViewModels.Database) => database.rid === this.selectedNode().rid);
     }