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intarray: return empty zero-dimensional array for an empty array

Previously a one-dimensional empty array was returned, but its textrepresentation matched a zero-dimensional array, and there is no way todump/reload a one-dimensional empty array.BACKWARD INCOMPATIBILITYPer report from elein

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contrib/intarray
- _int_tool.c

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`‎contrib/intarray/_int_tool.c`

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Original file line number	Diff line number	Diff line change
`@@ -246,6 +246,13 @@ resize_intArrayType(ArrayType *a, int num)`
`246`	`246`	`intnbytes=ARR_DATA_OFFSET(a)+sizeof(int)*num;`
`247`	`247`	`inti;`
`248`	`248`
	`249`	`+/* if no elements, return a zero-dimensional array */`
	`250`	`+if (num==0)`
	`251`	`+{`
	`252`	`+ARR_NDIM(a)=0;`
	`253`	`+returna;`
	`254`	`+}`
	`255`	`+`
`249`	`256`	`if (num==ARRNELEMS(a))`
`250`	`257`	`returna;`
`251`	`258`

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Commitc155f65

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`‎contrib/intarray/_int_tool.c`

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