Pull request #430: REPORT-31053 PDF导出，<br>标签丢失

Merge in CORE/base-third from ~HUGH.C/base-third:release/10.0 to release/10.0

* commit 'f8adc802e3e9b1f755d09b913744571296173205':
  REPORT-31053 PDF导出，<br>标签丢失

fine-itext/src/com/fr/third/v2/lowagie/text/pdf/PdfLine.java

@@ -177,7 +177,7 @@ public class PdfLine {
         if (chunk.isBreakTag()) {
             addToLine(chunk);
             width = 0;
-            return null;
+            return new PdfChunk("", chunk);
         }
 
         // we split the chunk to be added