[Rd] density() fails if x contains Inf or -Inf (PR#8033)

[michael.beer@unifr.ch]

Full_Name: Michael Beer
Version: 2.1.0 and 2.1.1
OS: linux-gnu and mingw32
Submission from: (NULL) (134.21.49.141)


The command "density(c(0.5,0.6,Inf,0.7))" fails saying "Wrong type for argument
2 in call to massdist". This problem can be resolved by replacing "nx = nx" by
"nx = as.integer(nx)" in the call to massdist. When there are infinite values,
the value of sum(x.finite) is attributed to nx before. Thus nx is changed to
class "numeric" instead of "integer".