tdf#123144 - Always translate an error number to a vba error message

In addition, create a meaningful error message and don't create and
artificial error message if there exists a custom one.

Change-Id: I682e497ee3fdfe4da80fb17ab41c1b4cf90eb2cb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122206
Tested-by: Jenkins
Reviewed-by: Andreas Heinisch <andreas.heinisch@yahoo.de>

basic/qa/cppunit/test_vba.cxx

@@ -85,6 +85,7 @@ void VBATest::testMiscVBAFunctions()
         "day.vb",
         "enum.vb",
         "error.vb",
+        "error_message.vb",
         "Err.Raise.vb",
         "exp.vb",
         "fix.vb",