console: handle internal.format_lua exceptions

Currently the call to internal.format_lua in format_lua_value is covered
by pcall only for `status == true`, however the opposite case also can
raise an exception. This patch adds the missed exception handling.

Part of #6781
Part of #6934

NO_DOC=bugfix
NO_CHANGELOG=minor bug
NO_TEST=not possible to trigger format_lua failure for !status