Fix r81869: ISO-8859-15 was seen as an alias to ISO-8859-1
Fix r81869: ISO-8859-15 was seen as an alias to ISO-8859-1

Don't use normalize_encoding() result if it is truncated.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator