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Commit05f239e

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Fix corner-case coredump in _SPI_error_callback().

I noticed that _SPI_execute_plan initially sets spierrcontext.arg = NULL,and only fills it in some time later. If an error were to happen inbetween, _SPI_error_callback would try to dereference the null pointer.This is unlikely --- there's not much between those points exceptpush-snapshot calls --- but it's clearly not impossible. Tweak thecallback to do nothing if the pointer isn't set yet.It's been like this for awhile, so back-patch to all supported branches.

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src/backend/executor
- spi.c

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`‎src/backend/executor/spi.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -2453,6 +2453,9 @@ _SPI_error_callback(void *arg)`
`2453`	`2453`	`constcharquery= (constchar)arg;`
`2454`	`2454`	`intsyntaxerrposition;`
`2455`	`2455`
	`2456`	`+if (query==NULL)/* in case arg wasn't set yet */`
	`2457`	`+return;`
	`2458`	`+`
`2456`	`2459`	`/*`
`2457`	`2460`	`* If there is a syntax error position, convert to internal syntax error;`
`2458`	`2461`	`* otherwise treat the query as an item of context stack`

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Commit05f239e

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`‎src/backend/executor/spi.c‎`

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