Fix segfault when using local rms + parallel deconv
When one of the subimages has no pixel to clean (i.e. mask fully false), Radler would try to read the rms value at a pixel beyond the image size. This bug was reported by Frits S.
When one of the subimages has no pixel to clean (i.e. mask fully false), Radler would try to read the rms value at a pixel beyond the image size. This bug was reported by Frits S.