tdf#42982 improve UNO API error reporting

Change-Id: Ibaf4bb0a9c9a8f613fd63ccd53a0e29d840fb21a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137904
Tested-by: Jenkins
Reviewed-by: Hossein <hossein@libreoffice.org>
diff --git a/accessibility/source/extended/accessibletablistbox.cxx b/accessibility/source/extended/accessibletablistbox.cxx
index ef915d0..f4bffa6 100644
--- a/accessibility/source/extended/accessibletablistbox.cxx
+++ b/accessibility/source/extended/accessibletablistbox.cxx
@@ -100,7 +100,7 @@ namespace accessibility
            xRet = implGetTable();

        if ( !xRet.is() )
            throw RuntimeException();
            throw RuntimeException("getAccessibleChild called with NULL xRet",static_cast< cppu::OWeakObject * >(this));

        return xRet;
    }