DPU description is not nullable.

Update SQL script:
UPDATE "DB"."ODCS"."DPU_INSTANCE" SET "description" = '' WHERE "description" IS NULL;
ALTER TABLE "DB"."ODCS"."DPU_INSTANCE" ADD "tmp_description" LONG VARCHAR NOT NULL DEFAULT '';
UPDATE "DB"."ODCS"."DPU_INSTANCE" SET "tmp_description" = "description";
ALTER TABLE "DB"."ODCS"."DPU_INSTANCE" DROP "description";
ALTER TABLE "DB"."ODCS"."DPU_INSTANCE" ADD "description" LONG VARCHAR NOT NULL DEFAULT '';
UPDATE "DB"."ODCS"."DPU_INSTANCE" SET "description" = "tmp_description";
ALTER TABLE "DB"."ODCS"."DPU_INSTANCE" DROP "tmp_description";

UPDATE "DB"."ODCS"."DPU_TEMPLATE" SET "description" = '' WHERE "description" IS NULL;
ALTER TABLE "DB"."ODCS"."DPU_TEMPLATE" ADD "tmp_description" LONG VARCHAR NOT NULL DEFAULT '';
UPDATE "DB"."ODCS"."DPU_TEMPLATE" SET "tmp_description" = "description";
ALTER TABLE "DB"."ODCS"."DPU_TEMPLATE" DROP "description";
ALTER TABLE "DB"."ODCS"."DPU_TEMPLATE" ADD "description" LONG VARCHAR NOT NULL DEFAULT '';
UPDATE "DB"."ODCS"."DPU_TEMPLATE" SET "description" = "tmp_description";
ALTER TABLE "DB"."ODCS"."DPU_TEMPLATE" DROP "tmp_description";