clean up

ddtrace/contrib/trace_utils.py

@@ -44,9 +44,6 @@
     from ddtrace.settings import IntegrationConfig  # noqa:F401
 
 
-_EMPTY_STRING_PATTERN = re.compile(r"")
-
-
 log = get_logger(__name__)
 
 wrap = wrapt.wrap_function_wrapper
@@ -413,7 +410,7 @@ def _set_url_tag(integration_config, span, url, query):
         # TODO(munir): deprecate and remove ddtrace.config.global_query_string_obfuscation_disabled,
         # setting config._obfuscation_query_string_pattern to an empty string should be enough to disable obfuscation
         span.set_tag_str(http.URL, url)
-    elif getattr(config._obfuscation_query_string_pattern, "pattern", None) == b"":
+    elif getattr(config._obfuscation_query_string_pattern, "pattern") == b"":
         # if obfuscation is enabled but the pattern is empty, this means config.global_query_string_obfuscation_disabled
         # was manually set to False, so we should strip the whole query string
         span.set_tag_str(http.URL, strip_query_string(url))