Change test to consider nulls in mult lvls

So rather than just testing the inner most json,
test to see it doesn't except null at multiple
levels of the json

Author: ssikdar1

pandas/tests/io/json/test_normalize.py

@@ -376,26 +376,31 @@ def test_nonetype_dropping(self):
 
         assert result == expected
 
-    def test_nonetype_inner_most_level(self):
-        # GH21158: If the inner most json has a key with a null value
+    def test_nonetype_multiple_levels(self):
+        # GH21158: If inner level json has a key with a null value
         # make sure it doesnt do a new_d.pop twice and except
         data = {
-            "subject": {
-                "pairs": {
-                    "A1-A2": {
-                        "atlases": {
-                            "avg.corrected": {
-                                "region": None,
-                                "x": 49.151580810546875,
-                                "y": -33.148521423339844,
-                                "z": 27.572303771972656}}}
-                }
+            "id": None,
+            "location": {
+                "id": None,
+                "country": {
+                    "id": None,
+                    "state": {
+                        "id": None,
+                        "town.info": {
+                            "region": None,
+                            "x": 49.151580810546875,
+                            "y": -33.148521423339844,
+                            "z": 27.572303771972656}}}
             }
         }
         result = nested_to_record(data)
         expected = {
-            'subject.pairs.A1-A2.atlases.avg.corrected.region': None,
-            'subject.pairs.A1-A2.atlases.avg.corrected.x': 49.151580810546875,
-            'subject.pairs.A1-A2.atlases.avg.corrected.y': -33.148521423339844,
-            'subject.pairs.A1-A2.atlases.avg.corrected.z': 27.572303771972656}
+            'location.id': None,
+            'location.country.id': None,
+            'location.country.state.id': None,
+            'location.country.state.town.info.region': None,
+            'location.country.state.town.info.x': 49.151580810546875,
+            'location.country.state.town.info.y': -33.148521423339844,
+            'location.country.state.town.info.z': 27.572303771972656}
         assert result == expected