db: Fix the db app, and show a message instead of an ugly error when you're not signed in.

core/core.js

@@ -716,12 +716,12 @@ async function getProcessBlob(blobId, key, options) {
 						Object.keys(db).map((x) => [x, db[x].bind(db)])
 					);
 				};
-				imports.databases = function () {
+				imports.databases = async function () {
 					return [].concat(
-						databases.list(
+						await databases.list(
 							':shared:' + process.credentials.session.name + ':%'
 						),
-						databases.list(process.credentials.session.name + ':%')
+						await databases.list(process.credentials.session.name + ':%')
 					);
 				};
 			}