Prevent Correlation command crash with 0-area ROIs
Version 0.4.3 release

0.4.3 Release Notes
~~~~~~~~~~~~~~~~~~~

Note: This version of Slide Set is a beta release.

Updates from the previous version:

- Set table values from sequence
- Fix synchronization errors in ROI editor image list
- Allow non-integer thresholds for Manders' Colocalization
  Coefficients and Threshold Segmentation commands
- Miscellaneous bug fixes