Handle iteration over 0 or 1 target objects #25
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SWIFTGalaxieswould fail with various errors in cases where a list of targets of length 0 or 1 was passed to theHaloCatalogueused to set it up. Users wouldn't normally attempt this, but it can easily come up in automated target selection scripts. These cases are now handled properly: iteration will proceed over a of length 0 or 1 in these cases.Thanks to Will Roper for pointing this out.