[erlang-patches] code_server & ERL_LIBS bug

[Serge Aleynikov]

There's an error in code server that causes erl & erlc to hang at 
startup if ERL_LIBS environment variable is set to an empty string or a 
string containing non-existing directories.

Here's how to reproduce it:

$ export ERL_LIBS=
$ erl

or

$ export ERL_LIBS="/a/b/c"
$ erl

Attached patch corrects the problem.

Regards,

Serge
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