What version are you running?
RBTools 0.2rc1
What steps will reproduce the problem?
1. Create and submit a perforce changelist via post-review 
2. Publish the changelist
3. Now make an additional change to the changelist, and attempt to resubmit
using post-review
What is the expected output? What do you see instead?
I expect to have it successfully update the review in RB (as it did with
RBTools 0.2beta2).  Instead I get this stack trace in post-review:
Traceback (most recent call last):
  File "/usr/local/bin/post-review", line 8, in <module>
    load_entry_point('RBTools==0.2rc1', 'console_scripts', 'post-review')()
  File "build/bdist.linux-x86_64/egg/rbtools/postreview.py", line 2774, in main
  File "build/bdist.linux-x86_64/egg/rbtools/postreview.py", line 2423, in
tempt_fate
  File "build/bdist.linux-x86_64/egg/rbtools/postreview.py", line 427, in
new_review_request
UnboundLocalError: local variable 'rsp' referenced before assignment
What operating system are you using? What browser?
Client is Mac OS X.
Please provide any additional information below.