Fix add or alter tag value to object will error out when tag's allowe…

…d_values is null.

Now, if tag's allowed_values is null, when we add or alter tag value to object will error out. In this commit, we fix this unreasonable behavior. We can add or alter any tag value to object when the tag's allowed_values is null.

Authored-by: Zhang Wenchao zwcpostgres@gmail.com

fix #ISSUE_Number

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apache / cloudberry