CmisApi::get_application_advertisement catch AttributeError as well (#316)

- Description
Catch both TypeError and AttributeError in CmisApi::get_application_advertisement because an AttributeError will be thrown when updating a dict with None.

- Motivation and Context
Fix issue found during automation tests

- How Has This Been Tested?
Manually test
Added new unit test

Signed-off-by: Stephen Sun <stephens@nvidia.com>

Author: stephenxs

sonic_platform_base/sonic_xcvr/api/public/cmis.py

@@ -1889,7 +1889,7 @@ def get_application_advertisement(self):
             # Read the application advertisement in page01
             try:
                 dic.update(self.xcvr_eeprom.read(consts.APPLS_ADVT_FIELD_PAGE01))
-            except TypeError as e:
+            except (TypeError, AttributeError) as e:
                 logger.error('Failed to read APPLS_ADVT_FIELD_PAGE01: ' + str(e))
                 return ret
 

tests/sonic_xcvr/test_cmis.py

@@ -2019,6 +2019,12 @@ def test_get_application_advertisement(self):
         assert result[1]['media_lane_count'] == 4
         assert result[1]['host_lane_assignment_options'] == 0x01
 
+    def test_get_application_advertisement_non_support(self):
+        self.api.xcvr_eeprom.read = MagicMock(return_value = None)
+        self.api.is_flat_memory = MagicMock(return_value = False)
+        result = self.api.get_application_advertisement()
+        assert result == {}
+
     def test_get_application(self):
         self.api.xcvr_eeprom.read = MagicMock()
         self.api.xcvr_eeprom.read.return_value = 0x20