add null check

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1868317 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/xslf/usermodel/XSLFShape.java

             @Override
             public FlipMode getFlipMode() {
                 CTTileInfoProperties tile = blipFill.getTile();
-                switch (tile == null ? STTileFlipMode.INT_NONE : tile.getFlip().intValue()) {
+                switch (tile == null || tile.getFlip() == null ? STTileFlipMode.INT_NONE : tile.getFlip().intValue()) {
                     default:
                     case STTileFlipMode.INT_NONE:
                         return FlipMode.NONE;

src/ooxml/testcases/org/apache/poi/ooxml/TestPOIXMLProperties.java

     }
 
     private static String zeroPad(long i) {
-        if (i >= 0 && i <=9) {
+        if (i >= 0 && i <= 9) {
             return "0" + i;
         } else {
             return String.valueOf(i);