Commits on Jul 11, 2018

1. Syntax: allow empty case without when …

   The following is no longer a syntax error:
   ```
   case foo # expands to `foo`
   end
   
   case foo # expands to `foo; bar`
   else
     bar
   end
   ```
   
   While an empty case doesn't make much sense in regular code, it is
   useful for automatically generated `when` branches (for example in a macro)
   and avoids extra effort to prevent empty case nodes.
   
   This also fixes a parsing error for `case` without condition (`case;
   when true; end`).

   

   straight-shoota committed Jul 11, 2018
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