forcepoint#48 null deref

Change-Id: I790fc6dafc0d8c9783b9dddc266b313af2a046d7
Reviewed-on: https://gerrit.libreoffice.org/56463
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
(cherry picked from commit 6725491c)

sw/source/core/unocore/unoportenum.cxx

@@ -288,22 +288,25 @@ namespace
             ::sw::mark::AnnotationMark* const pAnnotationMark =
                 dynamic_cast< ::sw::mark::AnnotationMark* >(ppMark->get());
 
-            if ( pAnnotationMark == nullptr )
-            {
+            if (!pAnnotationMark)
                 continue;
-            }
 
             const SwPosition& rStartPos = pAnnotationMark->GetMarkStart();
-            if ( rStartPos.nNode == nOwnNode )
+            if (rStartPos.nNode != nOwnNode)
+                continue;
+
+            const SwFormatField* pAnnotationFormatField = pAnnotationMark->GetAnnotationFormatField();
+            if (!pAnnotationFormatField)
             {
-                const SwFormatField* pAnnotationFormatField = pAnnotationMark->GetAnnotationFormatField();
-                assert(pAnnotationFormatField != nullptr);
-                rAnnotationStartArr.insert(
-                    std::make_shared<SwAnnotationStartPortion_Impl>(
-                            SwXTextField::CreateXTextField(&rDoc,
-                                pAnnotationFormatField),
-                            rStartPos));
+                SAL_WARN("sw.core", "missing annotation format field");
+                continue;
             }
+
+            rAnnotationStartArr.insert(
+                std::make_shared<SwAnnotationStartPortion_Impl>(
+                        SwXTextField::CreateXTextField(&rDoc,
+                            pAnnotationFormatField),
+                        rStartPos));
         }
     }
 }