Steps to reproduce: 1. Checkout the `develop` branch, create a new Text block and add some text 2. Resize it 3. Click 'Save Draft' 4. Reload the page 5. Expected: there's no validation error 6. Actual: there's a validation error:  The validation error: <img width="1188" alt="validation-error-here" src="https://user-images.githubusercontent.com/4063887/59229863-44191200-8ba1-11e9-8e30-dd6c495e0a70.png">