trace_exception can take None as an argument

CHANGELOG.md

 # v2.16.6
+
+* trace_exception can take None as an argument

satella/__init__.py

-__version__ = '2.16.6a1'
+__version__ = '2.16.6a2'

satella/opentracing/exceptions.py

@@ -7,17 +7,20 @@ from satella.instrumentation import Traceback
 from satella.opentracing.trace import Span
 
 
-def trace_exception(span: Span, exc_type: tp.Optional[ExceptionClassType] = None,
+def trace_exception(span: tp.Optional[Span], exc_type: tp.Optional[ExceptionClassType] = None,
                     exc_val: tp.Optional[Exception] = None,
                     exc_tb: tp.Optional[types.TracebackType] = None) -> None:
     """
     Log an exception's information to the chosen span, as logs and tags.
 
-    :param span: span to log into
+    :param span: span to log into or None for a no-op
     :param exc_type: exception type. If None this will be taken from sys.exc_info.
     :param exc_val: exception value. If None this will be taken from sys.exc_info.
     :param exc_tb: exception traceback. If None this will be taken from sys.exc_info.
     """
+    if span is None:
+        return
+
     if exc_type is None:
         exc_type, exc_val, exc_tb = sys.exc_info()
         if exc_type is None:

tests/test_opentracing.py

+import unittest
+
+from satella.opentracing import trace_exception
+
+
+class TestOpentracing(unittest.TestCase):
+    def test_trace_exception_none(self):
+        trace_exception(None)