Fix to logic determining if context.matched in response (#646)

* fix to logic determining if context.matched in response

* Update changelog

* Update CHANGELOG.md

* pre-commit formatting for #646

---------

Co-authored-by: Pete Gadomski <pete.gadomski@gmail.com>

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+- Fix to logic determining if `context.matched` in `ItemSearch.matched` response [#646](https://github.com/stac-utils/pystac-client/pull/646)
+
 ### Fixed
 
 - Recursion error in `get_items` [#608](https://github.com/stac-utils/pystac-client/pull/608)

pystac_client/item_search.py

@@ -671,7 +671,7 @@ def matched(self) -> Optional[int]:
         resp = self._stac_io.read_json(self.url, method=self.method, parameters=params)
         found = None
         if "context" in resp:
-            found = resp["context"]["matched"]
+            found = resp["context"].get("matched", None)
         elif "numberMatched" in resp:
             found = resp["numberMatched"]
         if found is None: