Fix #253 ensure column size on IndexImpl (#254)

Author: mbastian

src/main/java/org/gephi/graph/impl/IndexImpl.java

@@ -217,6 +217,7 @@ protected void addAllColumns(ColumnImpl[] cols) {
         ensureColumnSize(cols.length);
         for (ColumnImpl col : cols) {
             ColumnIndexImpl index = createIndex(col);
+            ensureColumnSize(col.storeId);
             columns[col.storeId] = index;
             columnsCount++;
         }