reverted change to measurable_transform_logprob

Author: Luke LB

pymc/logprob/transforms.py

@@ -419,7 +419,7 @@ def measurable_transform_logprob(op: MeasurableTransform, values, *inputs, **kwa
         jacobian = jacobian.sum(axis=tuple(range(-ndim_supp, 0)))
 
     # The jacobian is used to ensure a value in the supported domain was provided
-    return pt.switch(pt.isnan(input_logprob + jacobian), -np.inf, input_logprob + jacobian)
+    return pt.switch(pt.isnan(jacobian), -np.inf, input_logprob + jacobian)
 
 
 @_logcdf.register(MeasurableTransform)
@@ -739,7 +739,6 @@ def backward(self, value, *inputs):
         return pt.arccosh(value)
 
 
-
 class TanhTransform(RVTransform):
     name = "tanh"
     ndim_supp = 0