Description of problem:
After upgrading to 1.10 and apply the SQL schema upgrade I found the Koji Web page indicating an error while processing my request.  In /var/log/httpd/error_log I found my page requesting causing:

[Mon Aug 31 11:11:10.096815 2015] [wsgi:error] [pid 6208] 96 [ERROR] m=index u=None p=6208 r=10.209.44.12:44663 koji.web: Traceback (most recent call last):
[Mon Aug 31 11:11:10.096833 2015] [wsgi:error] [pid 6208]   File "/usr/share/koji-web/scripts/wsgi_publisher.py", line 385, in handle_request
[Mon Aug 31 11:11:10.096838 2015] [wsgi:error] [pid 6208]     result = func(environ, **data)
[Mon Aug 31 11:11:10.096841 2015] [wsgi:error] [pid 6208]   File "/usr/share/koji-web/scripts/index.py", line 306, in index
[Mon Aug 31 11:11:10.096844 2015] [wsgi:error] [pid 6208]     return _genHTML(environ, 'index.chtml')
[Mon Aug 31 11:11:10.096848 2015] [wsgi:error] [pid 6208]   File "/usr/share/koji-web/lib/kojiweb/util.py", line 142, in _genHTML
[Mon Aug 31 11:11:10.096851 2015] [wsgi:error] [pid 6208]     return tmpl_inst.respond().encode('utf-8', 'replace')
[Mon Aug 31 11:11:10.096867 2015] [wsgi:error] [pid 6208]   File "index_chtml.py", line 197, in respond
[Mon Aug 31 11:11:10.096870 2015] [wsgi:error] [pid 6208]   File "/usr/share/koji-web/lib/kojiweb/util.py", line 471, in taskScratchClass
[Mon Aug 31 11:11:10.096873 2015] [wsgi:error] [pid 6208]     if opts.get('scratch'):
[Mon Aug 31 11:11:10.096875 2015] [wsgi:error] [pid 6208] AttributeError: 'NoneType' object has no attribute 'get'


To debug this, I applied this to find out the "request" object looked like:

--- /usr/share/koji-web/lib/kojiweb/util.py-orig        2015-07-14 23:45:08.000000000 -0400
+++ /usr/share/koji-web/lib/kojiweb/util.py     2015-08-31 11:17:20.519893359 -0400
@@ -465,6 +465,7 @@
     build.
     """
     request = task_object['request']
+    print('JFDEBUG> request={!r}'.format(request))
     if len(request) >= 3:
         opts = request[2]
         if opts.get('scratch'):


I still get the same error, of course, but the log now reveals:

[Mon Aug 31 11:17:27.635331 2015] [wsgi:error] [pid 6402] JFDEBUG> request=[['d13677', 'daniel_brown'], True, None, 'f21-testing', 'mdct-aos-flash-2.29-1.fc21', 2, False, '']

The last thing I had done with the mdct-aos-flash-2.29-1.fc21 build was an attempt to untag it from f21-testing and before that to tag it with f21-released.  The untag operation (koji untag-build f21-testing --all mdct-aos-flash) simply wouldn't succeed -- I kept getting " koji error: SysCallError: (-1, 'Unexpected EOF')" which is when I decided trying to upgrade from 1.9 to 1.10.

I can't go any further as I don't know if taskScratchClass() is handling the request incorrectly or if the request was composed incorrectly.  For a quick kludge to get things running again I've just commented the whole method out except for the last line that returns a null string.  (Thankfully the docstring noted this method is just returning a CSS class so I doubt I'm doing anything bad here.)

FTR, 1.10 did finally allow me to do the untag operation.