Commits

Srikrishna Sekhar authored ed5303de2e3
CAS-14201 : Add check for mask validity

If a mask is provided to `tclean(niter=0)` it now checks for the existence _and_ validity of a mask image on disk. This fixes a bug where a string/textfile passed into the `mask` parameter of tclean would trigger it to try and open the mask with `ia.open`. Now if the mask image is not present on disk, it gracefully fails. Note that at this point it is not desirable to change the behaviour of tclean(niter=0) to create a mask if none is present on the disk.

Everything looks good. We'll let you know here if there's anything you should know about.

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