Maildir attachment extraction error handling changes to test.
Made changes for testing.
Work to test.
Further commits for continued testing on maildir extraction.
Maildir - attempting to make attachments unicode to avoid error.

Traceback (most recent call last):
  File "/usr/lib/archivematica/MCPClient/clientScripts/extractMaildirAttachments.py", line 134, in <module>
    etree.SubElement(attch, "name").text = attachment.name
  File "lxml.etree.pyx", line 904, in lxml.etree._Element.text.__set__ (src/lxml/lxml.etree.c:37110)
  File "apihelpers.pxi", line 729, in lxml.etree._setNodeText (src/lxml/lxml.etree.c:16917)
  File "apihelpers.pxi", line 1364, in lxml.etree._utf8 (src/lxml/lxml.etree.c:22039)
TypeError: Argument must be bytes or unicode, got 'LangTagged'
<type 'exceptions.TypeError'>
(u"Argument must be bytes or unicode, got 'LangTagged'",)
Edits to avoid errors in maildir attachment extraciton.

Traceback (most recent call last):
  File "/usr/lib/archivematica/MCPClient/clientScripts/extractMaildirAttachments.py", line 121, in <module>
    etree.SubElement(msg, "Subject").text = out["subject"]
  File "lxml.etree.pyx", line 904, in lxml.etree._Element.text.__set__ (src/lxml/lxml.etree.c:37110)
  File "apihelpers.pxi", line 721, in lxml.etree._setNodeText (src/lxml/lxml.etree.c:16855)
  File "apihelpers.pxi", line 1366, in lxml.etree._utf8 (src/lxml/lxml.etree.c:22060)
ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters
<type 'exceptions.ValueError'>
(u'All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters',)
Maildir - attachment extraction.

Fixing attempt extraction if filename can't be found.