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Document that analyzing an empty table doesn't update the statistics.

Per a suggestion from Sergey Konoplev

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Original file line number	Diff line number	Diff line change
`@@ -190,6 +190,12 @@ ANALYZE [ VERBOSE ] [ <replaceable class="PARAMETER">table</replaceable> [ ( <re`
`190`	`190`	`or updated, the inheritance statistics will not be up to date unless you`
`191`	`191`	`run <command>ANALYZE</command> manually.`
`192`	`192`	`</para>`
	`193`	`+`
	`194`	`+ <para>`
	`195`	`+ If the table being analyzed is completely empty, <command>ANALYZE</command>`
	`196`	`+ will not record new statistics for that table. Any existing statistics`
	`197`	`+ will be retained.`
	`198`	`+ </para>`
`193`	`199`	`</refsect1>`
`194`	`200`
`195`	`201`	`<refsect1>`

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