title: String index out of range while sending email
body: <p>I'm running into this error: <a href="http://pastebin.com/hH1ZbeWZ" rel="nofollow">link</a>, while trying to send mail with Django EmailMultiAlternatives. I tried searching for this error but no luck, also I tried removing or changing every variable for email, but with no luck.</p>
  
  <p>This is the code:</p>
  
  <pre><code>def spremembapodatkovproc(request):
      if request.method == 'POST':
          req_id = request.POST.get('req_num', 'Neznan ID zahtevka')
          old_email = request.user.email
          old_name = request.user.get_full_name
          new_email = request.POST.get('email_new', 'Nov e-mail ni znan')
          new_fname = request.POST.get('fname_new', 'Novo ime ni znano')
          dokument = request.FILES.get('doc_file')
          komentar = request.POST.get('comment', 'Ni komentarja')
          # try:
          plaintext = get_template('email/usr-data-change.txt')
          htmly = get_template('email/usr-data-change.html')
  
          d = Context(
              {
                  'old_email': old_email,
                  'old_fname': old_name,
                  'new_email': new_email,
                  'new_fname': new_fname,
                  'req_id': req_id,
                  'komentar': komentar,
                  'user_ip': request.META.get('REMOTE_ADDR', 'IP Naslova ni mogoče pridobiti.')
              }
          )
  
          subject, from_email, to = 'eBlagajna Sprememba podatkov', 'eblagajna@ksoft.si', ["info@korenc.eu"]
          text_content = plaintext.render(d)
          html_content = htmly.render(d)
          print(text_content)
          msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
          msg.attach_alternative(html_content, "text/html")
  
          msg.mixed_subtype = 'related'
  
          for f in ["templates\\email\\img1.png"]:
              fp = open(os.path.join(BASE_DIR, f), 'rb')
              msg_img = MIMEImage(fp.read())
              fp.close()
              msg_img.add_header('Content-ID', '&lt;{}&gt;'.format(f))
              msg.attach(msg_img)
          msg.send()
  </code></pre>
  
  <p>Thank you for your help.</p>