fix for variants without a format

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@16002 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/variant/VCFRecord.java

@@ -122,6 +122,8 @@ class VCFRecord
   
   protected String getFormatValue(String key)
   {
+    if(getFormat() == null)
+      return null;
     String fmts[] = COLON_PATTERN.split(getFormat());
     for(int i=0; i<fmts.length; i++)
     {