v1.6.2

### Release Notes

This is a bugfix release that fixes a couple of minor issues. Projects containing one or more empty documents would trigger a rebuild of the index each time the project was opened. This has now been fixed. Another fix resolves an error message being written to the console logging output when a new document was created. Both errors were harmless.

### Detailed Changelog

**Bugfixes**

* Fixed an issue where projects containing empty documents would trigger an index rebuild on open, but the empty document would be skipped due to a check that skips empty documents. As a consequence, the index would be rebuilt each time the project was opened. Empty documents are now added to the index, resolving this issue. Issue #1020. PR #1022.
* Fixed an issue where the shasum calculation would be performed when a new document was created, which would fail as the file did not yet exist. The error was handled, but an error message was printed to the console log. The shasum is now no longer called if the file doesn't already exist. Issue #1021. PR #1023.