AC_CHECK_FUNC with empty else path

[NightStrike]

If I do this:

AC_CHECK_FUNC(
  [chokeme],
  [],
  []
)

It will yield shell code that ends in:

if
  :
else

fi


Which produces a configure script that dies with:
"syntax error near unexpected token `fi'"

Is this an autoconf bug, or user error on my part?