Align async fetchxml JSON parsing with sync pattern

Replace broad try/except around r.json() with hasattr guard, matching
the sync FetchXmlQuery pattern. Remove the now-obsolete test that
verified the exception-swallowing behavior.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Abel Milash

src/PowerPlatform/Dataverse/aio/models/async_fetchxml_query.py

@@ -99,10 +99,7 @@ async def execute_pages(self) -> AsyncIterator[QueryResult]:
                     headers={"Prefer": _PREFER_HEADER},
                     params={"fetchXml": current_xml},
                 )
-                try:
-                    data = r.json()
-                except Exception:
-                    data = {}
+                data = r.json() if hasattr(r, "json") else {}
 
                 items = data.get("value") if isinstance(data, dict) else None
                 page_records: List[Record] = []

tests/unit/aio/test_async_query.py

@@ -500,17 +500,6 @@ async def test_execute_multi_page_no_cookie_simple_paging(self, async_client, mo
         assert len(result) == 2
         assert any("simple paging" in str(warning.message) for warning in w)
 
-    async def test_execute_json_parse_error_yields_empty_page(self, async_client, mock_od):
-        """execute() yields an empty page when the response body cannot be parsed as JSON."""
-        mock_od._entity_set_from_schema_name = AsyncMock(return_value="accounts")
-
-        resp = MagicMock()
-        resp.json = MagicMock(side_effect=Exception("invalid json"))
-        mock_od._request = AsyncMock(return_value=resp)
-
-        result = await async_client.query.fetchxml(_SIMPLE_FETCHXML).execute()
-        assert len(result) == 0
-
     async def test_execute_raises_on_max_pages_exceeded(self, async_client, mock_od):
         """execute() raises ValidationError when paging exceeds the maximum page limit."""
         import urllib.parse