switch_between_code_and_test crashes on untitled views: AttributeError on file_name().split

[dpc00]

Package Control: CodeTestSwitcher 2014.09.12.14.06.52 (python 3.3) on Sublime Text 4200 / Windows.

Repro. Open an unsaved scratch (no file_name()), then run switch_between_code_and_test.

Result. Uncaught exception; nothing happens in the buffer.

Traceback (most recent call last):
  File ".../python33/sublime_plugin.py", line 1437, in run_
    return self.run(edit)
  File ".../CodeTestSwitcher.sublime-package/code_test_switcher.py", line 10, in run
  File ".../CodeTestSwitcher.sublime-package/code_test_switcher.py", line 23, in opposite_file_names
AttributeError: 'NoneType' object has no attribute 'split'

Cause. opposite_file_names does:

file_name = self.view.file_name().split(os.sep)[-1]

view.file_name() is None for untitled buffers.

Fix. Return early (or show the existing "No file found" message) when there is no path:

def opposite_file_names(self):
    path = self.view.file_name()
    if not path:
        return []
    file_name = path.split(os.sep)[-1]
    ...

Did not run the project-walk path (os.walk of every window folder) on a saved file.