Transaction reader not properly converting all NULL values into usable SQL

drizzled/message/transaction_reader is misinterpreting the transaction log contents:

The data below shows that the transaction log itself is capturing the data properly (is_null is noted correctly). However, transaction reader is not reassembling the log into proper SQL - the generated INSERT fails.

Original data:
INSERT INTO `c` VALUES (1,NULL,'',2,'t',NULL,'d','v','','h',3251880405938208768,'v',0,'q',NULL,NULL,'n','h',1,6,'look','TYZGK','b','JRKMQ',NULL);

Transaction_reader output, note how we don't have NULL between 't' and 'd', between NULL and 'n'
INSERT INTO `test`.`c` (`pk`,`col_int_key`,`col_text_not_null_key`,`col_bigint_key`,`col_char_10_not_null`,`col_text_key`,`col_char_10_not_null_key`,`col_enum`,`col_text_not_null`,`col_enum_key`,`col_bigint_not_null_key`,`col_enum_not_null`,`col_int_not_null_key`,`col_char_1024`,`col_int`,`col_text`,`col_enum_not_null_key`,`col_char_10`,`col_bigint_not_null`,`col_int_not_null`,`col_char_1024_not_null`,`col_char_1024_not_null_key`,`col_char_10_key`,`col_char_1024_key`,`col_bigint`) VALUES (1,NULL,'',2,'t',,'d',v,'',h,3251880405938208768,v,0,'q',NULL,,n,'h',1,6,'look','TYZGK','b','JRKMQ',NULL);

statement {
  type: INSERT
  start_timestamp: 1284763044959043
  end_timestamp: 1284763045008367
  insert_header {
    table_metadata {
      schema_name: "test"
      table_name: "c"
    }
    field_metadata {
      type: INTEGER
      name: "pk"
    }
    field_metadata {
      type: INTEGER
      name: "col_int_key"
    }
    field_metadata {
      type: BLOB
      name: "col_text_not_null_key"
    }
    field_metadata {
      type: BIGINT
      name: "col_bigint_key"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_10_not_null"
    }
    field_metadata {
      type: BLOB
      name: "col_text_key"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_10_not_null_key"
    }
    field_metadata {
      type: ENUM
      name: "col_enum"
    }
    field_metadata {
      type: BLOB
      name: "col_text_not_null"
    }
    field_metadata {
      type: ENUM
      name: "col_enum_key"
    }
    field_metadata {
      type: BIGINT
      name: "col_bigint_not_null_key"
    }
    field_metadata {
      type: ENUM
      name: "col_enum_not_null"
    }
    field_metadata {
      type: INTEGER
      name: "col_int_not_null_key"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_1024"
    }
    field_metadata {
      type: INTEGER
      name: "col_int"
    }
    field_metadata {
      type: BLOB
      name: "col_text"
    }
    field_metadata {
      type: ENUM
      name: "col_enum_not_null_key"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_10"
    }
    field_metadata {
      type: BIGINT
      name: "col_bigint_not_null"
    }
    field_metadata {
      type: INTEGER
      name: "col_int_not_null"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_1024_not_null"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_1024_not_null_key"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_10_key"
    }
    field_metadata {
      type: VARCHAR
      name: "col_char_1024_key"
    }
    field_metadata {
      type: BIGINT
      name: "col_bigint"
    }
  }
  insert_data {
    segment_id: 1
    end_segment: true
    record {
      insert_value: "1"
      insert_value: ""
      insert_value: ""
      insert_value: "2"
      insert_value: "t"
      insert_value: ""
      insert_value: "d"
      insert_value: "v"
      insert_value: ""
      insert_value: "h"
      insert_value: "3251880405938208768"
      insert_value: "v"
      insert_value: "0"
      insert_value: "q"
      insert_value: ""
      insert_value: ""
      insert_value: "n"
      insert_value: "h"
      insert_value: "1"
      insert_value: "6"
      insert_value: "look"
      insert_value: "TYZGK"
      insert_value: "b"
      insert_value: "JRKMQ"
      insert_value: ""
      is_null: false
      is_null: true
      is_null: false
      is_null: false
      is_null: false
      is_null: true
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: true
      is_null: true
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: false
      is_null: true
    }
  }
}