Fix ArrayIndexOutOfBoundsException if XWPFRun does not set style

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1889259 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/xwpf/usermodel/XWPFRun.java

@@ -1248,16 +1248,11 @@ public class XWPFRun implements ISDTContents, IRunElement, CharacterRun {
      */
     public String getStyle() {
         CTRPr pr = getCTR().getRPr();
-        if (pr == null) {
+        if (pr == null || pr.sizeOfRStyleArray() <= 0) {
             return "";
         }
-
         CTString style = pr.getRStyleArray(0);
-        if (style == null) {
-            return "";
-        }
-
-        return style.getVal();
+        return null == style ? "" : style.getVal();
     }
 
 

poi-ooxml/src/test/java/org/apache/poi/xwpf/usermodel/TestXWPFRun.java

@@ -788,6 +788,17 @@ class TestXWPFRun {
         document.close();
     }
 
+    @Test
+    void testGetEmptyStyle() throws IOException {
+        XWPFDocument document = new XWPFDocument();
+        final XWPFRun run = document.createParagraph().createRun();
+        assertEquals("", run.getStyle());
+
+        run.getCTR().addNewRPr();
+        assertEquals("", run.getStyle());
+        document.close();
+    }
+
     @Test
     void testGetDepthWidth() throws IOException, InvalidFormatException {
         try (XWPFDocument doc = XWPFTestDataSamples.openSampleDocument("TestDocument.docx")) {