Description of problem:

Yum does not react well to missing architecture in a repository.

Version-Release number of selected component (if applicable):

2.6.0-1

How reproducible:

Point yum at a repository that exists, but does not have support for the current
architecture you are using.  (x86_64 and alglx repository is a good test.)
Instead of warning that the directory does not exist, it gives errors about
malformed xml and other useless errors.

Steps to Reproduce:
1. Use a x86_64 install of FC5
2. Add the alglx repository or some other repository that does not have x86_64
binaries.
3. yum update
  
Actual results:

Lots of useless errors that mask the real problem.
[root@dagon ~]# yum --enablerepo=aiglx update > /home/alan/yum.log
//var/cache/yum/aiglx/repomd.xml:16: parser error : Opening and ending tag
mismatch: link line 15 and head
        </head>
               ^
//var/cache/yum/aiglx/repomd.xml:22: parser error : Opening and ending tag
mismatch: img line 22 and a
<a href="/"><img src="/images/header-fedora_logo01.png" alt="Fedora Project"></a
                                                                               ^
//var/cache/yum/aiglx/repomd.xml:23: parser error : Opening and ending tag
mismatch: a line 22 and div
                        </div>
                              ^
//var/cache/yum/aiglx/repomd.xml:27: parser error : Opening and ending tag
mismatch: img line 27 and a
        <a href="/Download/"><img src="/images/header-download.png" alt="
">Download</a
                                                                               
      ^
//var/cache/yum/aiglx/repomd.xml:28: parser error : Opening and ending tag
mismatch: img line 28 and a
ef="/About/Projects/"><img src="/images/header-projects.png" alt=" ">Projects</a
                                                                               ^
//var/cache/yum/aiglx/repomd.xml:29: parser error : Opening and ending tag
mismatch: img line 29 and a
                                        <a href="/About/FAQ.html"><img
src="/images/header-faq.png" alt=" ">FAQ</a>
                                                                               
                                  ^
//var/cache/yum/aiglx/repomd.xml:29: parser error : Opening and ending tag
mismatch: a line 29 and span
a href="/About/FAQ.html"><img src="/images/header-faq.png" alt=" ">FAQ</a></span
                                                                               ^
//var/cache/yum/aiglx/repomd.xml:30: parser error : Opening and ending tag
mismatch: a line 28 and div
                        </div>
                              ^
//var/cache/yum/aiglx/repomd.xml:31: parser error : Opening and ending tag
mismatch: a line 27 and div
                </div>
                      ^
//var/cache/yum/aiglx/repomd.xml:52: parser error : Entity 'nbsp' not defined
                        <div class="fedora-corner-tr">&nbsp;</div>
                                                            ^
//var/cache/yum/aiglx/repomd.xml:53: parser error : Entity 'nbsp' not defined
                        <div class="fedora-corner-tl">&nbsp;</div>
                                                            ^
//var/cache/yum/aiglx/repomd.xml:60: parser error : Entity 'nbsp' not defined
                        <div class="fedora-corner-br">&nbsp;</div>
                                                            ^
//var/cache/yum/aiglx/repomd.xml:61: parser error : Entity 'nbsp' not defined
                        <div class="fedora-corner-bl">&nbsp;</div>
                                                            ^
//var/cache/yum/aiglx/repomd.xml:93: parser error : Entity 'copy' not defined
                        Copyright &copy; 2003-2005 Red Hat, Inc. All rights
reserved.
                                        ^
//var/cache/yum/aiglx/repomd.xml:96: parser error : Opening and ending tag
mismatch: br line 96 and div
                        <br>            </div>
                                              ^
//var/cache/yum/aiglx/repomd.xml:111: parser error : Opening and ending tag
mismatch: br line 95 and body
        </body>
               ^
//var/cache/yum/aiglx/repomd.xml:112: parser error : Opening and ending tag
mismatch: br line 94 and html
</html>
       ^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag div line 92

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag span line 26

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag div line 25

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag div line 21

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag div line 20

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag body line 18

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag link line 14

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag meta line 13

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag link line 7

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag meta line 6

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag head line 4

^
//var/cache/yum/aiglx/repomd.xml:113: parser error : Premature end of data in
tag html line 3

^
http://download.fedora.redhat.com/pub/fedora/projects/aiglx/x86_64/repodata/repomd.xml:
[Errno -1] Error importing repomd.xml for aiglx: Error: could not parse file
//var/cache/yum/aiglx/repomd.xml
Trying other mirror.
Cannot open/read repomd.xml file for repository: aiglx
failure: repodata/repomd.xml from aiglx: [Errno 256] No more mirrors to try.
Error: failure: repodata/repomd.xml from aiglx: [Errno 256] No more mirrors to try.

Expected results:


Additional info: