Removed unused import, fixed a bug in X12.parse.
Removed unused import, fixed a bug in X12.parse.

sbuss/TigerShark,sbuss/TigerShark,sbuss/TigerShark,jdavisp3/TigerShark,jdavisp3/TigerShark,sbuss/TigerShark,jdavisp3/TigerShark,jdavisp3/TigerShark