fix mypy failures

Author: BurnzZ

scrapy_zyte_api/responses.py

@@ -21,7 +21,7 @@ def replace(self, *args, **kwargs):
         return instance
 
     @property
-    def zyte_api_response(self) -> Dict:
+    def zyte_api_response(self) -> Optional[Dict]:
         """Contains the raw API response from Zyte API.
 
         To see the full list of parameters and their description, kindly refer to the

tests/test_api_requests.py

@@ -44,7 +44,7 @@ async def test_browser_html_request(self, meta: Dict[str, Dict[str, Any]]):
                 coro = handler._download_request(req, Spider("test"))
                 assert iscoroutine(coro)
                 assert not isinstance(coro, Deferred)
-                resp = await coro  # NOQA
+                resp = await coro  # type: ignore
 
             assert isinstance(resp, TextResponse)
             assert resp.request is req
@@ -81,7 +81,7 @@ async def test_http_response_body_request(self, meta: Dict[str, Dict[str, Any]])
                 coro = handler._download_request(req, Spider("test"))
                 assert iscoroutine(coro)
                 assert not isinstance(coro, Deferred)
-                resp = await coro  # NOQA
+                resp = await coro  # type: ignore
 
             assert isinstance(resp, Response)
             assert resp.request is req
@@ -109,7 +109,7 @@ async def test_http_response_headers_request(self, meta: Dict[str, Dict[str, Any
                 coro = handler._download_request(req, Spider("test"))
                 assert iscoroutine(coro)
                 assert not isinstance(coro, Deferred)
-                resp = await coro  # NOQA
+                resp = await coro  # type: ignore
 
             assert resp.request is req
             assert resp.url == req.url