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Don't abort pg_basebackup when receiving empty WAL block

This is a similar fix asc6ec8799.2. This should never happen in 9.3 and newer since the special casecannot happen there, but this patch synchronizes up the code so thereis no confusion on why they're different. An empty block is as harmlessin 9.3 as it was in 9.2, and can safely be ignored.

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src/bin/pg_basebackup
- receivelog.c

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`‎src/bin/pg_basebackup/receivelog.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -989,7 +989,7 @@ HandleCopyStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,`
`989`	`989`	`hdr_len+=8;/* dataStart */`
`990`	`990`	`hdr_len+=8;/* walEnd */`
`991`	`991`	`hdr_len+=8;/* sendTime */`
`992`		`-if (r<hdr_len+1)`
	`992`	`+if (r<hdr_len)`
`993`	`993`	`{`
`994`	`994`	`fprintf(stderr,_("%s: streaming header too small: %d\n"),`
`995`	`995`	`progname,r);`

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Commit8e41c62

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`‎src/bin/pg_basebackup/receivelog.c`

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