fix split partitions

[007gzs]

when run mydumper with --split-partitions , tables without partition will be skip;

[007gzs]

db sql:

create table no_p (id int not null ,PRIMARY KEY (`id`))ENGINE=InnoDB;
create table has_p (id int not null ,PRIMARY KEY (`id`))ENGINE=InnoDB PARTITION BY KEY (id) PARTITIONS 4;
insert into no_p(id) values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),(16),(17),(18),(19);
insert into has_p(id) values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),(16),(17),(18),(19);

run arg:
./mydumper -h 127.0.0.1 -p root --split-partitions -P 3306 -u root -a -B mydumper_test -o ./test_sql -t 1 --less-locking -v 3 -F 500 -L test_sql.log

res:

ll test_sql
total 36
drwxr-x--- 2 ljuser ljuser 4096 Mar  1 17:28 ./
drwxrwxr-x 5 ljuser ljuser 4096 Mar  1 17:28 ../
-rw-rw-r-- 1 ljuser ljuser  534 Mar  1 17:28 metadata
-rw-rw---- 1 ljuser ljuser  338 Mar  1 17:28 mydumper_0.has_p.00000.sql
-rw-rw---- 1 ljuser ljuser  340 Mar  1 17:28 mydumper_0.has_p.00001.sql
-rw-rw---- 1 ljuser ljuser  410 Mar  1 17:28 mydumper_0.has_p-schema.sql
-rw-rw---- 1 ljuser ljuser  362 Mar  1 17:28 mydumper_0.no_p-schema.sql
-rw-rw---- 1 ljuser ljuser  392 Mar  1 17:28 mydumper_0-schema-create.sql
-rw-rw---- 1 ljuser ljuser  230 Mar  1 17:28 mydumper_0-schema-triggers.sql