Clarify that if statement on time_stamp variable is to check that the time...

Clarify that if statement on time_stamp variable is to check that the time stamp and by extension the input file are properly formatted

lemi2seed/utils.py

@@ -117,6 +117,8 @@ def convert_coordinate(coordinate: str, hemisphere: str) -> Optional[float]:
 def convert_time(time_stamp: str) -> Optional[UTCDateTime]:
     """Convert time stamp recorded by LEMI to UTC."""
     msg = ("Failed to convert time stamp - {} - to UTC!".format(time_stamp))
+    # Check that time_stamp is properly formatted - Otherwise this may indicate
+    # that the input file was corrupted
     if re.match(r"^\d{4} \d{2} \d{2} \d{2} \d{2} \d{2}$", time_stamp):
         try:
             time_stamp = UTCDateTime(time_stamp)

tests/test_utils.py

@@ -185,7 +185,7 @@ class TestConvertTime(unittest.TestCase):
 
     def test_convert_time_erroneous_type(self):
         """Test basic functionality of convert_time."""
-        time_stamp = '2020 09 30 20 74 00a'
+        time_stamp = '2021 111 222 1 1 1'
         self.assertEqual(convert_time(time_stamp), None)