Ignore the table of contents when creating a document

The object containing the toc has no body, which lead
to `NullPointerExceptions` during document generation

build.gradle

@@ -8,7 +8,7 @@ plugins {
 }
 
 group 'com.docutools'
-version = '1.5.1'
+version = '1.5.2'
 
 sourceCompatibility = JavaVersion.VERSION_17
 targetCompatibility = JavaVersion.VERSION_17

src/main/java/com/docutools/jocument/impl/word/WordGenerator.java

@@ -15,6 +15,7 @@
 import org.apache.poi.util.LocaleUtil;
 import org.apache.poi.xwpf.usermodel.IBodyElement;
 import org.apache.poi.xwpf.usermodel.XWPFParagraph;
+import org.apache.poi.xwpf.usermodel.XWPFSDT;
 import org.apache.poi.xwpf.usermodel.XWPFTable;
 
 class WordGenerator {
@@ -39,7 +40,7 @@ private void generate() {
     for (int i = 0; i < elements.size(); i++) {
       var element = elements.get(i);
 
-      if (!WordUtilities.exists(element)) {
+      if (element instanceof XWPFSDT || !WordUtilities.exists(element)) {
         continue;
       }
 

src/test/java/com/docutools/jocument/impl/word/WordGeneratorTest.java

@@ -343,4 +343,23 @@ void shouldScaleLargePicture() throws IOException, InterruptedException {
         var documentWrapper = new XWPFDocumentWrapper(xwpfDocument);
         assertThat(documentWrapper.bodyElement(0).asParagraph().run(0).pictures(), hasSize(1));
     }
+
+    @Test
+    @DisplayName("Process Document With TOC")
+    void shouldProcessDocumentWithTOC() throws IOException, InterruptedException {
+        // Assemble
+        Template template = Template.fromClassPath("/templates/word/TOCTemplate.docx")
+            .orElseThrow();
+        PlaceholderResolver resolver = new ReflectionResolver(SampleModelData.FUTURE_PICARD);
+
+        // Act
+        Document document = template.startGeneration(resolver);
+        document.blockUntilCompletion(60000L); // 1 minute
+
+        // Assert
+        assertThat(document.completed(), is(true));
+        xwpfDocument = TestUtils.getXWPFDocumentFromDocument(document);
+        var documentWrapper = new XWPFDocumentWrapper(xwpfDocument);
+        assertThat(documentWrapper.bodyElement(0).asParagraph().runs(), hasSize(1));
+    }
 }