Fix a null pointer exception in DumpRenderTree (issue 1792567)

The first test causes NullPointerException in DumpRenderTree because dumpAsText
could return a null string.

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/DumpRenderTree/src/com/android/dumprendertree/TestShellActivity.java b/tests/DumpRenderTree/src/com/android/dumprendertree/TestShellActivity.java
index bf8a3b35a443..404d1012c7dd 100644
--- a/tests/DumpRenderTree/src/com/android/dumprendertree/TestShellActivity.java
+++ b/tests/DumpRenderTree/src/com/android/dumprendertree/TestShellActivity.java
@@ -165,7 +165,8 @@ public class TestShellActivity extends Activity implements LayoutTestController
             if (mDialogStrings != null)
                 os.write(mDialogStrings.toString().getBytes());
             mDialogStrings = null;
-            os.write(webkitData.getBytes());
+            if (webkitData != null)
+                os.write(webkitData.getBytes());
             os.flush();
             os.close();
         } catch (IOException ex) {