[Native Bayes] Fix error when converting Vector to CSRNumericTable

[minmingzhu]

When converting Vector to CSRNumericTable, If multiple rows without non-zero elements , we only calculated once for rowOffsets Array.

// Converted to one CSRNumericTable
    for (row <- 0 until vectors.length) {
      val rowVector = vectors(row)
      rowVector.foreachActive { (column, value) =>
        values(indexValues) = value
        // one-based indexValues
        columnIndices(indexValues) = column + 1

        if (row > curRow) {
          curRow = row
          // one-based indexValues
          rowOffsets += indexValues + 1
        }

        indexValues = indexValues + 1
      }
    }
    // one-based row indexValues
    rowOffsets += indexValues + 1