When no tests selected to run, cafe-parallel output to a report fails with uncaught exception

[dgou]

Here is the failed run, with report options specified where the tag doesn't find any tests:

$ cafe-parallel test.config my.test.class.here -P class -w 4 --result xml --result-directory ./results.xml -t regression


Utilizing the pathos multiprocess library. This feature is experimental


    ( (
     ) )
  .........
  |       |___
  |       |_  |
  |  :-)  |_| |
  |       |___|
  |_______|
=== CAFE Runner ===
======================================================================================================================================================
Percolated Configuration
------------------------------------------------------------------------------------------------------------------------------------------------------
BREWING FROM: ....: ...
ENGINE CONFIG FILE: ...
TEST CONFIG FILE..: ...
DATA DIRECTORY....: ...
LOG PATH..........: ...
======================================================================================================================================================
Traceback (most recent call last):
  File "/Users/dgou/.virtual_envs/c1db5d67f3c7533e/bin/cafe-parallel", line 11, in <module>
    load_entry_point('opencafe==0.3.2', 'console_scripts', 'cafe-parallel')()
  File "/Users/dgou/.virtual_envs/c1db5d67f3c7533e/lib/python2.7/site-packages/cafe/drivers/unittest/runner_parallel.py", line 284, in entry_point
    exit(runner.run())
  File "/Users/dgou/.virtual_envs/c1db5d67f3c7533e/lib/python2.7/site-packages/cafe/drivers/unittest/runner_parallel.py", line 122, in run
    results=results)
  File "/Users/dgou/.virtual_envs/c1db5d67f3c7533e/lib/python2.7/site-packages/cafe/drivers/unittest/runner_parallel.py", line 202, in compile_results
    reporter = Reporter(result_parser, all_results)
UnboundLocalError: local variable 'result_parser' referenced before assignment

Here is a run without report options specified:

$ cafe-parallel test.config my.test.class.here -P class -w 4 -t regression


Utilizing the pathos multiprocess library. This feature is experimental


    ( (
     ) )
  .........
  |       |___
  |       |_  |
  |  :-)  |_| |
  |       |___|
  |_______|
=== CAFE Runner ===
======================================================================================================================================================
Percolated Configuration
------------------------------------------------------------------------------------------------------------------------------------------------------
BREWING FROM: ....: ...
ENGINE CONFIG FILE: ...
TEST CONFIG FILE..: ...
DATA DIRECTORY....: ...
LOG PATH..........: ...
======================================================================================================================================================
----------------------------------------------------------------------
Ran 0 tests in 0.004s
Generated datasets in 0.073s
Total runtime 0.076s

PASSED ======================================================================================================================================================
Detailed logs: ...
------------------------------------------------------------------------------------------------------------------------------------------------------