Don't try to close if the lazy initialize hasn't triggered

git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@1815 348d0f76-0448-11de-a6fe-93d51630548a

java/src/org/broadinstitute/sting/utils/genotype/vcf/VCFGenotypeWriterAdapter.java

@@ -99,7 +99,8 @@ public class VCFGenotypeWriterAdapter implements GenotypeWriter {
     /** finish writing, closing any open files. */
     @Override
     public void close() {
-        mWriter.close();
+        if (mInitialized)
+            mWriter.close();
     }
 
     /**