Fixed #29543 -- Fixed CPointerBase.__del__() ImportError crash.

AUTHORS

@@ -602,6 +602,7 @@ answer newbie questions, and generally made Django that much better:
     Morten Bagai <m@bagai.com>
     msaelices <msaelices@gmail.com>
     msundstr
+    Mushtaq Ali <mushtaak@gmail.com>
     Mykola Zamkovoi <nickzam@gmail.com>
     Nagy Károly <charlie@rendszergazda.com>
     Nasimul Haque <nasim.haque@gmail.com>

django/contrib/gis/ptr.py

@@ -34,5 +34,5 @@ class CPointerBase:
         if self.destructor and self._ptr:
             try:
                 self.destructor(self.ptr)
-            except (AttributeError, TypeError):
+            except (AttributeError, ImportError, TypeError):
                 pass  # Some part might already have been garbage collected

tests/gis_tests/test_ptr.py

@@ -64,3 +64,11 @@ class CPointerBaseTests(SimpleTestCase):
         fg.ptr = ptr
         del fg
         destructor_mock.assert_called_with(ptr)
+
+    def test_destructor_catches_importerror(self):
+        class FakeGeom(CPointerBase):
+            destructor = mock.Mock(side_effect=ImportError)
+
+        fg = FakeGeom()
+        fg.ptr = fg.ptr_type(1)
+        del fg