tko/parsers: make status_line parsing more robust to bad inputs

tko/parsers/version_0_unittest.py

 #!/usr/bin/python
 
 import unittest
 
 import common
 from autotest_lib.client.common_lib.test_utils import mock
 from autotest_lib.tko import models
 from autotest_lib.tko.parsers import version_0
 
 
@@ skipping 198 matching lines @@
         self.assertEquals(line.status, "GOOD")
         self.assertEquals(line.subdir, None)
         self.assertEquals(line.testname, None)
         self.assertEquals(line.reason, "Test Passed")
         self.assertEquals(line.optional_fields,
                           {"field1": "val1", "field2": "val2"})
 
     def test_parse_line_handles_newline(self):
         input_data = ("\t\tGOOD\t----\t----\t"
                       "field1=val1\tfield2=val2\tNo newline here!")
-        for suffix in ("", "\n"):
+        for suffix in ("", "\n", "\n\n"):
             line = version_0.status_line.parse_line(input_data +
                                                     suffix)
             self.assertEquals(line.indent, 2)
             self.assertEquals(line.type, "STATUS")
             self.assertEquals(line.status, "GOOD")
             self.assertEquals(line.subdir, None)
             self.assertEquals(line.testname, None)
             self.assertEquals(line.reason, "No newline here!")
             self.assertEquals(line.optional_fields,
                               {"field1": "val1",
@@ skipping 24 matching lines @@
         self.assertEquals(line.type, "STATUS")
         self.assertEquals(line.status, "GOOD")
         self.assertEquals(line.subdir, "field")
         self.assertEquals(line.testname, "second field")
         self.assertEquals(line.reason, "needed last field")
         self.assertEquals(line.optional_fields, {})
 
 
     def test_parse_line_fails_on_bad_optional_fields(self):
         input_data = "GOOD\tfield1\tfield2\tfield3\tfield4"
-        self.assertRaises(AssertionError,
-                          version_0.status_line.parse_line,
-                          input_data)
+        self.assertEquals(None,
+                          version_0.status_line.parse_line(input_data))
 
 
 if __name__ == "__main__":
     unittest.main()