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Avoid core dump in _outPathInfo() for Path without a parent RelOptInfo.

Nearly all Paths have parents, but a ResultPath representing an empty FROMclause does not. Avoid a core dump in such cases. I believe this is onlya hazard for debugging usage, not for production, else we'd have heardabout it before. Nonetheless, back-patch to 9.1 where the troublesome codewas introduced. Noted while poking at bug #11703.

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src/backend/nodes
- outfuncs.c

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`‎src/backend/nodes/outfuncs.c`

Lines changed: 4 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1477,7 +1477,10 @@ _outPathInfo(StringInfo str, const Path *node)`
`1477`	`1477`	`{`
`1478`	`1478`	`WRITE_ENUM_FIELD(pathtype,NodeTag);`
`1479`	`1479`	`appendStringInfoString(str," :parent_relids ");`
`1480`		`-_outBitmapset(str,node->parent->relids);`
	`1480`	`+if (node->parent)`
	`1481`	`+_outBitmapset(str,node->parent->relids);`
	`1482`	`+else`
	`1483`	`+_outBitmapset(str,NULL);`
`1481`	`1484`	`appendStringInfoString(str," :required_outer ");`
`1482`	`1485`	`if (node->param_info)`
`1483`	`1486`	`_outBitmapset(str,node->param_info->ppi_req_outer);`

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Commit5ba062e

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`‎src/backend/nodes/outfuncs.c`

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