Documentation for qInstallMessageHandler is missing nullptr check

I do not know if this is a missing in the doc, or a problem in QProcess.

In short if the QProcess is destroyed BEFORE the end of the process the QMessageLogContext is populated with NULLPTR for file and function

context @0x55593eaf7ba8 QMessageLogContext &
category "default" char*
file 0x0 char*
function 0x0 char*
line 0 int
version 2 int

And this will trigger an error when calling the fprintf function.
I fixed adding a

auto file = context.file;
if (context.file == nullptr) {
 file = "NO FILE FOUND";
}