Allow UIA to work again on Win7 after pr #12210 (#12233)

With the merging of pr #12210 it became impossible to interact with UI Automation controls on Windows 7.

* Fetching the annotationTypes UIA property raises a COMError if not implemented by the control. On newer Operating Systems UIA core returns a default.
 * Fetching the SelectionPattern2 interface also causes a COMError on older Operating Systems if not implemented by the control.

Therefore: 
* Catch COMError when fetching UIA annotationTypes.
* Catch COMError when fetching the UIA SelectionPattern2 interface.

Fixes #12227

source/NVDAObjects/UIA/__init__.py

@@ -1193,10 +1193,14 @@ def _get_UIASelectionPattern(self):
 		return self.UIASelectionPattern
 
 	def _get_UIASelectionPattern2(self):
-		self.UIASelectionPattern2 = self._getUIAPattern(
-			UIAHandler.UIA_SelectionPattern2Id,
-			UIAHandler.IUIAutomationSelectionPattern2
-		)
+		try:
+			self.UIASelectionPattern2 = self._getUIAPattern(
+				UIAHandler.UIA_SelectionPattern2Id,
+				UIAHandler.IUIAutomationSelectionPattern2
+			)
+		except COMError:
+			# SelectionPattern2 is not available on older Operating Systems such as Windows 7
+			self.UIASelectionPattern2 = None
 		return self.UIASelectionPattern2
 
 	def getSelectedItemsCount(self, maxItems=None):
@@ -1462,7 +1466,11 @@ def _get_states(self):
 				states.add(controlTypes.STATE_CHECKABLE)
 				if s==UIAHandler.ToggleState_On:
 					states.add(controlTypes.STATE_CHECKED)
-		annotationTypes = self._getUIACacheablePropertyValue(UIAHandler.UIA_AnnotationTypesPropertyId)
+		try:
+			annotationTypes = self._getUIACacheablePropertyValue(UIAHandler.UIA_AnnotationTypesPropertyId)
+		except COMError:
+			# annotationTypes cannot be fetched on older Operating Systems such as Windows 7.
+			annotationTypes = None
 		if annotationTypes:
 			if UIAHandler.AnnotationType_Comment in annotationTypes:
 				states.add(controlTypes.STATE_HASCOMMENT)