Fix a bug causing read to output for expression

Author: arichiardi

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Bugs Fixed
+
+* [#77](https://github.com/clojure-emacs/inf-clojure/pull/77): Fix request "Eval expression:" if arglists return is `nil`.
+
 ## 2.0.0 (2017-05-01)
 
 ### New Features

inf-clojure.el

@@ -978,7 +978,7 @@ the results buffer.  It cuts out the output from
 See variable `inf-clojure-arglists-form'."
   (let* ((arglists-snippet (format (inf-clojure-arglists-form) fn))
          (arglists-result (inf-clojure-results-from-process (inf-clojure-proc) arglists-snippet))
-         (arglists-data (read arglists-result)))
+         (arglists-data (when arglists-result (read arglists-result))))
     (cond
      ((null arglists-data) nil)
      ((stringp arglists-data) arglists-data)