add check for measurement attributes (open-telemetry#2468)

Author: Alex Boten

opentelemetry-sdk/src/opentelemetry/sdk/_metrics/_view_instrument_match.py

@@ -59,8 +59,10 @@ def consume_measurement(self, measurement: Measurement) -> None:
             for key, value in measurement.attributes.items():
                 if key in self._attribute_keys:
                     attributes[key] = value
-        else:
+        elif measurement.attributes is not None:
             attributes = measurement.attributes
+        else:
+            attributes = {}
 
         attributes = frozenset(attributes.items())
 

opentelemetry-sdk/tests/metrics/test_view_instrument_match.py

@@ -86,6 +86,22 @@ def test_consume_measurement(self):
             },
         )
 
+        view_instrument_match = _ViewInstrumentMatch(
+            "name",
+            "unit",
+            "description",
+            self.mock_aggregation_class,
+            self.mock_instrumentation_info,
+            self.mock_resource,
+        )
+        view_instrument_match.consume_measurement(
+            Measurement(value=0, attributes=None)
+        )
+        self.assertEqual(
+            view_instrument_match._attributes_aggregation,
+            {frozenset({}): self.mock_aggregation_instance},
+        )
+
     def test_collect(self):
 
         view_instrument_match = _ViewInstrumentMatch(