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Add C comment about why we throw an error if the pg_upgrade old/newdatabase counts don't match.

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Original file line number	Diff line number	Diff line change
`@@ -37,6 +37,12 @@ transfer_all_new_dbs(DbInfoArr *old_db_arr,`
`37`	`37`
`38`	`38`	`prep_status("Restoring user relation files\n");`
`39`	`39`
	`40`	`+/*`
	`41`	`+ *If the user removed the 'postgres' database from the old cluster,`
	`42`	`+ *this will cause the database counts to not match and throw an error.`
	`43`	`+ *We could allow this to work because the new database is empty (we`
	`44`	`+ *checked), but we don't.`
	`45`	`+ */`
`40`	`46`	`if (old_db_arr->ndbs!=new_db_arr->ndbs)`
`41`	`47`	`pg_log(PG_FATAL,"old and new clusters have a different number of databases\n");`
`42`	`48`

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