Hide sandbox endpoint card when sandbox URL is omitted or empty (#3162)

[lahiruudayakumara]

Purpose

When an API is created with only a Production endpoint and no Sandbox endpoint, the Developer Portal landing page displays an empty "Sandbox" endpoint card containing an empty link URL box. This PR fixes the template conditional logic so that endpoint cards are only rendered when a valid endpoint URL exists.

Resolves #3162

Goals

• Prevent empty Sandbox or Production endpoint cards from appearing on the API overview landing page.
• Ensure endpoint visibility checks in Handlebars templates use truthy boolean evaluations ({{#if ...}}).

Approach

• Templates (api-default.hbs & mcp-default.hbs): Replaced {{#unless (eq resources.serverDetails.sandboxURL "")}} with {{#if resources.serverDetails.sandboxURL}} so the card container is only rendered when a non-empty Sandbox URL exists.
• Helpers (handlebarsHelpers.js): Updated the custom Handlebars eq helper to treat null and undefined as equivalent to an empty string "" when comparing against empty values, preventing unintended false results during Handlebars string comparisons.

User stories

As an API consumer viewing an API overview page, I want to see endpoint details only for the environments (Production / Sandbox) that are configured for that API, without empty placeholder cards.

Documentation

N/A - Frontend template display fix. No changes to user-facing documentation or API contracts.

Automation tests

• Unit tests

  Ran npm test across all Node.js unit tests in portals/api-portal (99/99 passed).

• Integration tests

  Verified template rendering for APIs configured with single vs. multiple endpoints.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

N/A

Related PRs

N/A

Test environment

• Node.js: 24.6.0
• OS: macOS (ARM64)
• Browsers: Chrome, Edge, Firefox

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📥 Commits

Reviewing files that changed from the base of the PR and between 2613ad3 and 6d00e9a.

📒 Files selected for processing (3)

• portals/api-portal/src/defaultContent/pages/api-landing/partials/api-default.hbs
• portals/api-portal/src/defaultContent/pages/mcp-landing/partials/mcp-default.hbs
• portals/api-portal/src/helpers/handlebarsHelpers.js

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