the crash reporter source code in app.cxx is currently hard-coded to
http://crashreport.libreoffice.org/submit/.
there is no way to configure/disable the crashreporter.
one has to rebuild libreoffice without FEATURE_BREAKPAD.

in an enterprise environment it may be necessary to prevent users from sending data due to security restrictions.

an option in Tools/Options/LibreOffice/General would be helpful.
for example, there is already an option to disable CollectUsageInformation.

app.cxx:
#if HAVE_FEATURE_BREAKPAD
void handleCrashReport()
{
    static const char SERVICENAME_CRASHREPORT[] = "com.sun.star.comp.svx.CrashReportUI";

    css::uno::Reference< css::uno::XComponentContext > xContext = ::comphelper::getProcessComponentContext();

    Reference< css::frame::XSynchronousDispatch > xRecoveryUI(
        xContext->getServiceManager()->createInstanceWithContext(SERVICENAME_CRASHREPORT, xContext),
        css::uno::UNO_QUERY_THROW);

    Reference< css::util::XURLTransformer > xURLParser =
        css::util::URLTransformer::create(::comphelper::getProcessComponentContext());

    css::util::URL aURL;
    css::uno::Any aRet = xRecoveryUI->dispatchWithReturnValue(aURL, css::uno::Sequence< css::beans::PropertyValue >());
    bool bRet = false;
    aRet >>= bRet;
}