segmenter.js: V-REGION identity % takes indels into accounts

However the value may not be defined (when there are no indels),
in which case it is empty. In such a case we fallback to the
identity % without indels.

browser/js/segmenter.js

@@ -576,8 +576,8 @@ Segment.prototype = {
             identity = clone.seg.imgt["V-REGION identity % (with ins/del events)"]
             if (typeof identity != 'undefined' && identity.length == 0)
                 identity = clone.seg.imgt["V-REGION identity %"]
-            var identityRate = parseFloat(identity)
-            if (identityRate != NaN) {
+            if (identity != NaN) {
+                var identityRate = parseFloat(identity)
                 info = document.createElement('span');
                 if (V_IDENTITY_THRESHOLD)
                     info.className += identityRate < V_IDENTITY_THRESHOLD ? ' identityGood' : ' identityBad'