Fix --matched and add tests

pystac_client/cli.py

@@ -40,7 +40,7 @@ def search(
     result = client.search(method=method, **kwargs)  # type: ignore[arg-type]
 
     if matched:
-        if nmatched := result.matched() is not None:
+        if (nmatched := result.matched()) is not None:
             print(f"{nmatched} items matched")
         else:
             raise KeyError("'matched' is not supported for this catalog")

tests/cassettes/test_cli/TestCLI.test_matched[inprocess].yaml

@@ -0,0 +1,110 @@
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+    method: GET
+    uri: https://earth-search.aws.element84.com/v1
+  response:
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