CAM: Fix crash when Path panel widgets are deleted

Prevent RuntimeError by safely handling missing or deleted geometry import
widgets in Path operation panels. This ensures the UI update code does not
fail if the underlying C++ objects are destroyed, improving stability when
panels are closed or the UI changes.

src/Mod/CAM/Path/Op/Base.py:
- Wrap geometry import widget access in try/except to avoid crashes
- Add error handling for panel widget deletion scenarios

(cherry picked from commit 900d5ae255)

src/Mod/CAM/Path/Op/Gui/Base.py

@@ -616,15 +616,23 @@ class TaskPanelBaseGeometryPage(TaskPanelPage):
         # Load available operations into combobox
         if len(availableOps) > 0:
             # Populate the operations list
-            panel.geometryImportList.blockSignals(True)
-            panel.geometryImportList.clear()
-            availableOps.sort()
-            for opLbl in availableOps:
-                panel.geometryImportList.addItem(opLbl)
-            panel.geometryImportList.blockSignals(False)
+            try:
+                panel.geometryImportList.blockSignals(True)
+                panel.geometryImportList.clear()
+                availableOps.sort()
+                for opLbl in availableOps:
+                    panel.geometryImportList.addItem(opLbl)
+                panel.geometryImportList.blockSignals(False)
+            except (AttributeError, RuntimeError):
+                # Widget doesn't exist in UI or C++ object already deleted
+                pass
         else:
-            panel.geometryImportList.hide()
-            panel.geometryImportButton.hide()
+            try:
+                panel.geometryImportList.hide()
+                panel.geometryImportButton.hide()
+            except (AttributeError, RuntimeError):
+                # Widget doesn't exist in UI or C++ object already deleted
+                pass
 
     def getTitle(self, obj):
         return translate("PathOp", "Base Geometry")