Fix for unhandled promise on fresh db startup

issue #977

- As of the addition of when/monitor/console we now get errors about unhandled promises
- This fixes one which appeared when starting up without a DB

core/server/data/migration/index.js

@@ -54,7 +54,7 @@ function getDatabaseVersion() {
                     return databaseVersion;
                 });
         }
-        return when.reject('Settings table does not exist');
+        throw new Error('Settings table does not exist');
     });
 }
 
@@ -99,7 +99,7 @@ module.exports = {
             }
 
         }, function (err) {
-            if (err === 'Settings table does not exist') {
+            if (err.message || err === 'Settings table does not exist') {
                 // 4. The database has not yet been created
                 // Bring everything up from initial version.
                 return self.migrateUpFreshDb();