The Edebug spec for and-let* inherits from if-let*, but and-let*
allows its code body to be empty and if-let*'s Edebug spec does not
permit that.

To reproduce:
Load test/lisp/emacs-lisp/subr-x-tests.el
M-x edebug-all-defs RET
M-x eval-buffer RET

Result: edebug-syntax-error: Invalid read syntax: "Expected form"

The error happens while instrumenting subr-x-and-let*-test-empty-varlist.

I noticed while looking at the Edebug specs for these macros that the
one for if-let* uses "sexp" to match a form which will be evaluated,
in the case where a test is not bound to a symbol (referred to as the
(VALUEFORM) case in the docstring).  This will cause Edebug to skip
over that test instead of stepping through it, so it should be changed
from "sexp" to "form".

After those two fixes, Edebug still fails to instrument
subr-x-tests.el because of a missing quote in subr-x-and-let*-test-group-1.

Here is a patch with all three of these fixed: