Fix type error with arguments being undefined (#2078)

* Fix type error with `arguments` being undefined

* Use the Coalesce Nullish operator

* add changeset

Co-authored-by: Arda TANRIKULU <ardatanrikulu@gmail.com>

Author: peter-formlogic

Diff for: .changeset/cool-ads-sin.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/delegate': patch
+---
+
+fix(delegate): Fix type error with `arguments` being undefined

Diff for: .changeset/itchy-pillows-trade.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/url-loader': patch
+---
+
+fix(url-loader): fix typing mismatch

Diff for: packages/delegate/src/transforms/AddArgumentsAsVariables.ts

@@ -83,7 +83,7 @@ function addVariablesToRootField(
 
     operation.selectionSet.selections.forEach((selection: SelectionNode) => {
       if (selection.kind === Kind.FIELD) {
-        const argumentNodes = selection.arguments;
+        const argumentNodes = selection.arguments ?? [];
         const argumentNodeMap: Record<string, ArgumentNode> = argumentNodes.reduce(
           (prev, argument) => ({
             ...prev,