fix in updateQualifierString() for updating product without evidence codes

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@10760 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/genebuilder/cv/ProductBox.java

@@ -185,7 +185,8 @@ class ProductBox extends AbstractCvBox
     }
     
     old = getField("evidence=", origQualifierString);
-    if(!old.equals(GoBox.evidenceCodes[2][ evidenceList.getSelectedIndex() ]))
+    if(evidenceList.getSelectedIndex() > -1 &&
+       !old.equals(GoBox.evidenceCodes[2][ evidenceList.getSelectedIndex() ]))
     {
       newQualifierString = changeField("evidence=", 
                    GoBox.evidenceCodes[2][ evidenceList.getSelectedIndex() ],