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kerl.el's Issues

kerl-use error when there is a single installation

M-x kerl-use

gives

Wrong type argument: stringp, nil

error when there is a single installation. Debugging:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  call-process(nil nil t nil "list" "installations")
  apply(call-process nil nil t nil ("list" "installations"))
  kerl--call-process("list" "installations")
  kerl-installations()
  (mapcar (function car) (kerl-installations))
  (kerl--completing-read "Erlang Version: " (mapcar (function car) (kerl-installations)))
  (let ((picked-erlang (kerl--completing-read "Erlang Version: " (mapcar (function car) (kerl-installations))))) (list picked-erlang))
  call-interactively(kerl-use)
  ido-hacks-execute-extended-command(nil)
  call-interactively(ido-hacks-execute-extended-command nil nil)
  command-execute(do-hacks-execute-extended-command)

In shell

$ kerl list installations
19.0 /Users/ilhan/.kerl/installs/19.0

EDIT: Same error with multiple installations as well. OS X 10.11.6, Emacs 24.5 (9.0) GUI. Terminal version is OK.

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