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Defend against null error message reported by libxml2.

While this isn't really supposed to happen, it can occur in OOMsituations and perhaps others. Instead of crashing, substitute"(no message provided)".I didn't worry about localizing this text, since we aren'tlocalizing anything else here; besides, if we're on the edge ofOOM, it's unlikely gettext() would work.Report and fix by Sergio Conde Gómez in bug #15624.Discussion:https://postgr.es/m/15624-4dea54091a2864e6@postgresql.org

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src/backend/utils/adt
- xml.c

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`‎src/backend/utils/adt/xml.c`

Lines changed: 4 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1696,7 +1696,10 @@ xml_errorHandler(void *data, xmlErrorPtr error)`
`1696`	`1696`	`appendStringInfo(errorBuf,"line %d: ",error->line);`
`1697`	`1697`	`if (name!=NULL)`
`1698`	`1698`	`appendStringInfo(errorBuf,"element %s: ",name);`
`1699`		`-appendStringInfoString(errorBuf,error->message);`
	`1699`	`+if (error->message!=NULL)`
	`1700`	`+appendStringInfoString(errorBuf,error->message);`
	`1701`	`+else`
	`1702`	`+appendStringInfoString(errorBuf,"(no message provided)");`
`1700`	`1703`
`1701`	`1704`	`/*`
`1702`	`1705`	`* Append context information to errorBuf.`

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Commit8e29567

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`‎src/backend/utils/adt/xml.c`

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