segmenter.js; don't use clone ID as default replacment of sequence

Link to #3945 & #3960

browser/js/segmenter.js

@@ -1495,7 +1495,7 @@ Sequence.prototype = Object.create(genSeq.prototype);
         str = typeof str !== 'undefined' ? str : this.m.clone(this.id).sequence;
 
         if (typeof this.m.clone(this.id).sequence == 'undefined' || this.m.clone(this.id).sequence === 0) {
-            str = this.m.clone(this.id).id
+            str = "" // By default don't show ID as sequence if clone haven't sequence content
         }
         
         this.seq = str.split("")