fix(pagination): only use startingToken if it exists

Author: icholy

packages/core/src/pagination/createPaginator.ts

@@ -33,12 +33,14 @@ export function createPaginator<
     input: InputType,
     ...additionalArguments: any[]
   ): Paginator<OutputType> {
-    let token: any = config.startingToken || undefined;
+    let token = config.startingToken;
     let hasNext = true;
     let page: OutputType;
 
     while (hasNext) {
-      (input as any)[inputTokenName] = token;
+      if (token) {
+        (input as any)[inputTokenName] = token;
+      }
       if (pageSizeTokenName) {
         (input as any)[pageSizeTokenName] = (input as any)[pageSizeTokenName] ?? config.pageSize;
       }