pablomartin4btc 3a26b19df2 bugfix: rest: avoid segfault for invalid URI ...

`evhttp_uri_parse` can return a nullptr, for example when the URI
contains invalid characters (e.g. "%").
`GetQueryParameterFromUri` passes the output of `evhttp_uri_parse`
straight into `evhttp_uri_get_query`, which means that anyone calling
a REST endpoint in which query parameters are used (e.g. `rest_headers`)
can cause a segfault.

This bugfix is designed to be minimal and without additional behaviour change.

Github-Pull: #27468
Rebased-From: 11422cc572

2023-04-18 11:43:59 +01:00

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