fix: skip null values in URL query param resolution

changelog/entries/unreleased/bug/3444_fix_urlresolution_query_param_null_check.json

@@ -0,0 +1,7 @@
+{
+    "type": "bug",
+    "message": "Fixed null check for query parameters in link URL generation",
+    "issue_number": 3444,
+    "bullet_points": [],
+    "created_at": "2025-02-17"
+}

e2e-tests/tests/builder/builderPage.spec.ts

@@ -110,6 +110,7 @@ test.describe("Builder page test suite", () => {
     await expect(page.locator(".box__title").getByText("Page")).toBeHidden();
     await page.getByText('Click to create an element').click();
     await page.getByText('Link A link to page/URL').click();
+    await page.getByLabel('my_param=').fill("foo")
     await page.getByRole('complementary').getByRole('textbox').click();
     await page.getByRole('complementary').getByRole('textbox').locator('div').first().fill('linkim');
     await page.locator('a').filter({hasText: 'Make a choice'}).click();
@@ -120,7 +121,7 @@ test.describe("Builder page test suite", () => {
     await page.getByText('my_param', { exact: true }).first().click();
     await page.click('body')
     await expect(page.getByRole('link', {name: 'linkim'})).toHaveAttribute(
-      'href', /\?my_param=null/);
+      'href', /\?my_param=foo/);
 
   });
 });

web-frontend/modules/builder/utils/urlResolution.js

@@ -67,6 +67,7 @@ export default function resolveElementUrl(
       .map(({ name, value }) => {
         if (!value) return null
         const resolvedValue = resolveFormula(value)
+        if (!resolvedValue && String(resolvedValue) !== '0') return null
         return `${encodeURIComponent(name)}=${encodeURIComponent(
           resolvedValue
         )}`