UResavePackagesCommandlet::CheckoutFile() logs warnings for skipped files

UResavePackagesCommandlet::CheckoutFile(const FString& Filename, bool bAddFile = false, bool bIgnoreAlreadyCheckedOut = false)

			if (CheckoutFile(PackageFilename, true, bIgnoreAlreadyCheckedOut))
			{
				SublevelFilenames.Add(PackageFilename);
				if (!SavePackageHelper(Package, PackageFilename))
				{
					UE_LOG(LogContentCommandlet, Error, TEXT("Failed to save existing package %s"), *PackageFilename);
				}
			}
			else
			{
				UE_LOG(LogContentCommandlet, Error, TEXT("Failed to check out existing package %s"), *PackageFilename);
			}