Turning explicit what happens on non-string element case for 'exports'

Author: caiolima

spec.emu

@@ -240,7 +240,9 @@ contributors: Nicolò Ribaudo
                 1. <ins>Else if _next_ is not a String, then</ins>
                   1. <ins>Let _error_ be ThrowCompletion(a newly created *TypeError* object).</ins>
                   1. <ins>Let _closeResult_ be Completion(IteratorClose(_iteratorRecord_, _error_)).</ins>
-                  1. <ins>IfAbruptRejectPromise(_closeResult_, _promiseCapability_).</ins>
+                  1. <ins>Assert: _closeResult_ and _error_ are the same Completion Record.</ins>
+                  1. <ins>Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, « _error_.[[Value]] »).</ins>
+                  1. <ins>Return _promiseCapability_.[[Promise]].</ins>
                 1. <ins>Else if _names_ does not contain _next_, then</ins>
                   1. <ins>Append _next_ to _names_.</ins>
               1. <ins>Set _importedNames_ to _names_.</ins>