Small addition, not sure if it is necessary

Samo Penic

2016-07-04 14779bacf71a5343338051dcb83efda309e23669

Small addition, not sure if it is necessary

 src/cluster.c

@@ -42,6 +42,7 @@
            do{
                n--;
            } while(cstlist->cluster[n]==NULL && n>i);
            if(i<=n) break;
            cstlist->cluster[i]=cstlist->cluster[n];
            cstlist->cluster[n]=NULL;
        }