Beanshell: Display full exception message

Useful to see where exactly the error occured

Change-Id: I716f54c4b1286d705b52f19a58f36f28a801e1d0
Reviewed-on: https://gerrit.libreoffice.org/69799
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

scripting/java/com/sun/star/script/framework/provider/beanshell/ScriptEditorForBeanShell.java

@@ -398,7 +398,7 @@ public class ScriptEditorForBeanShell implements ScriptEditor, ActionListener {
             try {
                 execute();
             } catch (Exception invokeException) {
-                showErrorMessage(invokeException.getMessage());
+                showErrorMessage(invokeException.toString());
             }
         } else if (actionCommand.equals("Save")) {
             saveTextArea();