Update UserPrompt to match legacy behavior if not expected value is s…

…et in YAML

scripts/py_matter_yamltests/matter_yamltests/pseudo_clusters/clusters/log_commands.py

@@ -39,12 +39,17 @@ class LogCommands(PseudoCluster):
     definition = _DEFINITION
 
     async def UserPrompt(self, request):
-        input_result = input("")
-        for value in request.arguments.get("values", []):
+      expected_value = None
+      for value in request.arguments.get("values", []):
             if value.get('name') and 'expectedValue' in value['name']:
-                request.responses = [{"values": [{"name": "expectedValue", "value": value['value']}]}]
-                return {"value": {"expectedValue": input_result}}
-        return {}
+                expected_value = value['value']
+                request.responses = [{"values": [{"name": "expectedValue", "value": expected_value}]}]
+
+      if expected_value is not None:
+        input_result = input("")
+        return {"value": {"expectedValue": input_result}}
+
+      return {}
 
     async def Log(self, request):
         pass