What version are you running?
RBTools 0.7.5

Review Board 2.0.18

Perforce 2015.2p3

What steps will reproduce the problem?

submit several changes to Perforce under //depot/path/to/dir/...
rbt post //depot/path/to/dir/...@1570748,@1570964






What is the expected output? What do you see instead?
Expected: the review to be posted
Actual: rbt fails with this error message:
File "/usr/local/lib/python2.7/dist-packages/RBTools-0.7.5-py2.7.egg/rbtools/clients/perforce.py", line 666, in get_changenum

    tip = revisions['tip']

TypeError: 'NoneType' object has no attribute 'getitem'

What operating system are you using?
Debian Linux 7.4

Attach the debug out from the command.
rbt post --debug //depot/path/to/dir/...@1570748,@1570964








RBTools 0.7.5

Python 2.7.3 (default, Mar 13 2014, 11:03:55) 

[GCC 4.7.2]

Running on Linux-3.10-0.bpo.tmw5-amd64-x86_64-with-debian-7.4

Home = /home/jloverso

Current directory = /local-ssd/tmp/Bmw

Checking for a Subversion repository...

Running: svn --non-interactive info

Command exited with rc 1: ['svn', '--non-interactive', u'info']

svn: '.' is not a working copy













Checking for a Git repository...

Running: git rev-parse --git-dir

Command exited with rc 128: ['git', 'rev-parse', '--git-dir']

fatal: Not a git repository (or any parent up to mount point /local-ssd)

Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).













Checking for a Mercurial repository...

Unable to execute "hg --help": skipping Mercurial

Checking for a CVS repository...

Checking for a Perforce repository...

Running: p4 info

Running: diff --version

repository info: Path: p4test.mathworks.com:1666, Base path: None, Supports changesets: True

Making HTTP GET request to http://reviewboard.mathworks.com/api/

Running: p4 info

Writing "//depot/path/to/dir/workflows_controller.rb#35" to "/tmp/tmpjNBNUR"

Running: p4 print -o /tmp/tmpjNBNUR -q //depot/path/to/dir/workflows_controller.rb#35

Writing "//depot/path/to/dir/workflows_controller.rb#37" to "/tmp/tmpFF_1Pi"

Running: p4 print -o /tmp/tmpFF_1Pi -q //depot/path/to/dir/workflows_controller.rb#37

Running: diff -urNp /tmp/tmpjNBNUR /tmp/tmpFF_1Pi

Command exited with rc 1: [u'diff', u'-urNp', '/tmp/tmpjNBNUR', '/tmp/tmpFF_1Pi']

Writing "//depot/path/to/dir/routes.rb#82" to "/tmp/tmpjNBNUR"

Running: p4 print -o /tmp/tmpjNBNUR -q //depot/path/to/dir/routes.rb#82

Writing "//depot/path/to/dir/routes.rb#83" to "/tmp/tmpFF_1Pi"

Running: p4 print -o /tmp/tmpFF_1Pi -q //depot/path/to/dir/routes.rb#83

Running: diff -urNp /tmp/tmpjNBNUR /tmp/tmpFF_1Pi

Command exited with rc 1: [u'diff', u'-urNp', '/tmp/tmpjNBNUR', '/tmp/tmpFF_1Pi']

Making HTTP GET request to http://reviewboard.mathworks.com/api/validation/diffs/

Cached response for HTTP GET http://reviewboard.mathworks.com/api/validation/diffs/ expired and was modified

Making HTTP POST request to http://reviewboard.mathworks.com/api/validation/diffs/

Traceback (most recent call last):

  File "/usr/local/bin/rbt", line 9, in <module>

    load_entry_point('RBTools==0.7.5', 'console_scripts', 'rbt')()

  File "/usr/local/lib/python2.7/dist-packages/RBTools-0.7.5-py2.7.egg/rbtools/commands/main.py", line 133, in main

    command.run_from_argv([RB_MAIN, command_name] + args)

  File "/usr/local/lib/python2.7/dist-packages/RBTools-0.7.5-py2.7.egg/rbtools/commands/init.py", line 622, in run_from_argv

    exit_code = self.main(*args) or 0

  File "/usr/local/lib/python2.7/dist-packages/RBTools-0.7.5-py2.7.egg/rbtools/commands/post.py", line 765, in main

    changenum = self.tool.get_changenum(self.revisions)

  File "/usr/local/lib/python2.7/dist-packages/RBTools-0.7.5-py2.7.egg/rbtools/clients/perforce.py", line 664, in get_changenum

    tip = revisions['tip']

TypeError: 'NoneType' object has no attribute 'getitem'





Please provide any additional information below.
The problem is that the code in post.py is attempting to find the change number to use as a commit_id, but when given a Perforce depot path and a set of revisions, there isn't a change number.
I fixed this by updating get_changenum in perforce.py to return None when "revisions" isn't populated (since it already had a code path that returned None).
--- /usr/local/lib/python2.7/dist-packages/RBTools-0.7.5-py2.7.egg/rbtools/clients/perforce.py  2016-01-12 11:22:40.788716724 -0500

+++ /tmp/perforce.py    2016-01-12 11:23:13.241199391 -0500

@@ -660,6 +660,8 @@

         # this to remove the server-side implementation and just implement

         # --guess-summary and --guess-description, but that would likely

         # create a lot of unhappy users.

+       if revisions is None or 'tip' not in revisions:

+           return None
     tip = revisions['tip']