Commits
CAS-14184 : Bugfix for niter=0 peakres calculation
If no mask was passed in for the niter=0 case, the `ImagingDict` class set the `mask` parameter to -1 (instead of the pixel mask). peakRes was always calcualted as `np.amax(image_pixels * mask_pixels)` so when mask = -1 it picked the highest negative as the peakRes. This commit fixes that bug, and has been confirmed to pass the previously failing task_tclean tests. Additionally, removed a check in test_task_tclean that asserted len(summaryminor) == 0 for niter = 0.