first iteration of __isub__ method in RankingStat

gstlal-inspiral/python/stats/inspiral_lr.py

@@ -1130,7 +1130,7 @@ class LnNoiseDensity(LnLRDensity):
 			# NOTE : __isub__ method is actually not defined in BinnedLnPDF
 			# class, so .array attribute needs to be called.
 			lnpdf.array -= other.densities[key].array
-			assert all(lnpdf.array>=0), "SNR-chisq histogam for %s in the denominator contains negative counts. Check if you are subtracting a right histogram."
+			assert all(lnpdf.array>=0), "SNR-chisq histogam for %s in the denominator contains negative counts. Check if you are subtracting a right histogram." % key
 		lnpdf.normalize()
 
 		try: