Add null check on get_tablespace_name() return in pg_get_database_ddl_internal

[SATYANARAYANA NARLAPURAM]

Hi Hackers,

A concurrent tablespace drop could lead to null deref in
pg_get_database_ddl. I acknowledge this is a corner case. Adding a patch to
fix this to keep the code clean.

Thanks,
Satya

0001-Fix-NULL-deref-in-pg_get_database_ddl-on-concurrent-tablespace-drop.patch
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