HI @shamicancode,
The easiest way to solve is to add to the methid used for saving the data a check to see if a image is present. If it's not present skip this field on update.
public function update(Product $product, Request $request) {
$product->name = $request->name;
// other fileds and check for image
if ($request->has('image')) {
$product->image = $request->image;
}
$product->save();
// do other things here
}
What I showed above is one way. You can tweak it as necessary.