Previously, Traceur would return an array of errors when several were

detected during compilation. The module loader would just report the
first. In 0.9.3 though, Tracuer was updated to instead throw a single
"MultipleErrors" type that contained all the errors inside it.

The module loader currently just reports "undefined" as the error, as
there is no array with elements, making for a rather opaque error when
a compilation error occurs.

This modifies it to still throw the first element when dealing with an
array for backwards compatibility, but will otherwise throw the full
exception.

Author: BennettJames

src/transpiler.js

@@ -47,8 +47,12 @@ var transpile = (function() {
       return compiler.compile(source, filename);
     }
     catch(e) {
-      // traceur throws an error array
-      throw e[0];
+      // on older versions of traceur (<0.9.3), an array of errors is thrown
+      // rather than a single error.
+      if (e.length) {
+        throw e[0];
+      }
+      throw e;
     }
   }