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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
`@@ -2367,6 +2367,9 @@ _SPI_error_callback(void *arg)`
`2367`	`2367`	`constcharquery= (constchar)arg;`
`2368`	`2368`	`intsyntaxerrposition;`
`2369`	`2369`
	`2370`	`+if (query==NULL)/* in case arg wasn't set yet */`
	`2371`	`+return;`
	`2372`	`+`
`2370`	`2373`	`/*`
`2371`	`2374`	`* If there is a syntax error position, convert to internal syntax error;`
`2372`	`2375`	`* otherwise treat the query as an item of context stack`

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Commit7eb16ab

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`‎src/backend/executor/spi.c`

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