Regression analysis: the additional testing of cloning sheets showed a

possible ArrayIndexOutOfBounds error which we can avoid to make cloning
fail a bit less.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1730274 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/usermodel/HSSFPicture.java

@@ -214,10 +214,12 @@ public class HSSFPicture extends HSSFSimpleShape implements Picture {
     void afterInsert(HSSFPatriarch patriarch) {
         EscherAggregate agg = patriarch.getBoundAggregate();
         agg.associateShapeToObjRecord(getEscherContainer().getChildById(EscherClientDataRecord.RECORD_ID), getObjRecord());
+        if(getPictureIndex() != -1) {
             EscherBSERecord bse =
                     patriarch.getSheet().getWorkbook().getWorkbook().getBSERecord(getPictureIndex());
             bse.setRef(bse.getRef() + 1);
         }
+    }
 
     /**
      * The filename of the embedded image