Fix create colocate table bug

[gengjun-git]

Proposed changes

Fix #5138

1. fix bug when create colocate table with empty partition.
2. put code groupName2Id.put(fullGroupName, groupId) to the end to avoid state inconsistent when exception thrown.
3. do not check backendsPerBucketSeq empty in replayAddTableToGroup(), cause backendsPerBucketSeq can be empty for colocate table with empty partition.

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[francisoliverlee]

nice. make a conclusion for update point as bellow

1. create colocated table or normal table (create table and create tablets)
2. tablet blancer
3. add partition
4. do replay edit log ( add it to editlog and replay it out )

[morningman]

LGTM