Never scripted on the form before... but...
Might something like this work?

myActiveXObject = new ActiveXObject("Scripting.FileSystemObject");
try {
file = myActiveXObject.GetFile(doc);
}
catch(err) {
moi.ui.alert(err.message);
}


var before = file.DateLastModified;
moi.geometryDatabase.save();
if (before == file.DateLastModified)
{
var msg = 'Failed to Save:\n\t' + doc
moi.ui.alert(msg);
}


I don't really know how to handle an error and get out cleanly.... just hope maybe this is a worthy attempt.