Backport to 2.12.x: #6113: Fix planner distributed table count #6120
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This is an automated backport of #6113: Fix planner distributed table count.
The original issue is #5966.
This PR will be merged automatically after all the relevant CI checks pass. If this fix should not be backported, or will be backported manually, just close this PR. You can use the backport branch to add your changes, it won't be modified automatically anymore.
For more details, please see the documentation
Original description
Fix planner distributed table count
The check for a distributed hypertable was done after ht had been changed to the compressed hypertable potentially leading to miscount or even segfault when the cache lookup for the compressed hypertable returned NULL.
Fixes
#5966