Fix reporting of "not checked" for check boxes with no other states i…

…n browse mode. (#10781)

When determining whether the caller wants states, we must differentiate between None and the empty set.
If the caller didn't want states, states will be None.
However, empty states means the caller still wants states, but the object had no states; e.g. an unchecked check box with no other states.
Previously, we treated an empty set as if the caller didn't want states.

source/braille.py

@@ -519,7 +519,7 @@ def getPropertiesBraille(**propertyValues) -> str:  # noqa: C901
 	value = propertyValues.get("value")
 	if value and role not in controlTypes.silentValuesForRoles:
 		textList.append(value)
-	if states:
+	if states is not None:
 		textList.extend(
 			controlTypes.processAndLabelStates(role, states, controlTypes.REASON_FOCUS, states, None, positiveStateLabels, negativeStateLabels)
 		)

source/speech/__init__.py

@@ -1499,10 +1499,16 @@ def getPropertiesSpeech(  # noqa: C901
 		textList.append(roleText if roleText else controlTypes.roleLabels[role])
 	if value:
 		textList.append(value)
-	states=propertyValues.get('states',set())
+	states = propertyValues.get('states')
 	realStates=propertyValues.get('_states',states)
 	negativeStates=propertyValues.get('negativeStates',set())
-	if states or negativeStates:
+	# If the caller didn't want states, states will be None.
+	# However, empty states means the caller still wants states, but the object
+	# had no states; e.g. an unchecked check box with no other states.
+	if states is not None or negativeStates:
+		if states is None:
+			# processAndLabelStates won't accept None for states.
+			states = set()
 		labelStates = controlTypes.processAndLabelStates(role, realStates, reason, states, negativeStates)
 		textList.extend(labelStates)
 	# sometimes description key is present but value is None