Sketch 45.1 removing all symbols from page.
In the most recent sketch release 45.1, symbol organizer removes all symbols from the symbols page. Symbols on pages then show errors like below.

![screenshot 2017-07-03 13 34 15](https://user-images.githubusercontent.com/1663090/27804399-555ed4b2-5ff4-11e7-9c30-25388eb75a54.png)
