Feature request: possibility to disable node not found warning

[jakobharder]

With increasing mod compatibility efforts there, my ModOps get complex only because I want to supress not found warnings.

In the following example I add a product to storage lists, but only if it's not added already (shared product).
So, not finding a storage list where the product is missing is an expected scenario and should not lead to a warning.

To avoid it I create a fake fallback Asset so that at least one list is always found, and remove that Asset later.

  <!-- create fallback container to avoid warnings in case the product is already available -->
  <ModOp Type="addNextSibling" GUID="120055">
    <Asset>
      <Template>fallback</Template>
      <Values>
        <Standard>
          <GUID>1500010221</GUID>
        </Standard>
        <ProductStorageList>
          <ProductList>
            <Item />
          </ProductList>
        </ProductStorageList>
      </Values>
    </Asset>
  </ModOp>
  <!-- StandardProductList,StandardMarketplaceModerateStorageList: after bricks -->
  <ModOp Type="addNextSibling" GUID="120055,120057" Path="/Values/ProductStorageList/ProductList/Item[Product='1010205' and not(../Item/Product='1500010825')] | //Values[Standard/GUID='1500010221']/ProductStorageList/ProductList/Item[last()]">
    <Item>
      <Product>1500010825</Product>
    </Item>
  </ModOp>
  <ModOp Type="remove" GUID="1500010221" />

The code would be a lot simpler, if we had a flag like disableNotFoundWarning I can set individually per ModOp.