Description of problem:
$ bugzilla query --product Fedora --version 18 --reporter kparal --boolean_query 'creation_ts-changedafter-2012-11-29T00:00:00 & creation_ts-changedbefore-2013-01-15T23:59:59' --outputformat='%{id};%{reporter};%{status};%{resolution};%{status_whiteboard};%{blocked}'

Version-Release number of selected component:
python-bugzilla-0.7.0-3.fc18

Additional info:
cmdline:        /usr/bin/python /usr/bin/bugzilla query --product Fedora --version 18 --reporter kparal --boolean_query 'creation_ts-changedafter-2012-11-29T00:00:00 & creation_ts-changedbefore-2013-01-15T23:59:59' --outputformat=%{id};%{reporter};%{status};%{resolution};%{status_whiteboard};%{blocked}
executable:     /usr/bin/bugzilla
kernel:         3.7.4-204.fc18.x86_64
uid:            1000

Truncated backtrace:
bugzilla:730:bug_field:TypeError: sequence item 0: expected string, int found

Traceback (most recent call last):
  File "/usr/bin/bugzilla", line 813, in <module>
    main()
  File "/usr/bin/bugzilla", line 736, in main
    print format_field_re.sub(bug_field,opt.outputformat)
  File "/usr/bin/bugzilla", line 730, in bug_field
    val = ','.join(val)
TypeError: sequence item 0: expected string, int found

Local variables in innermost frame:
b: <Bug #881670 on https://bugzilla.redhat.com/xmlrpc.cgi at 0x7f3985faf1d0>
val: [752665]
matchobj: <_sre.SRE_Match object at 0x267b7a0>
special_fields: {'flag': <function <lambda> at 0x26f1140>, 'whiteboard': <function <lambda> at 0x26f1230>}
rest: None
fieldname: 'blocked'