fix(CLARK-CLIENT-1T): Prevent TypeError when collections are empty on user profile

[sentry]

This PR addresses issue CLARK-CLIENT-1T, a TypeError occurring on the user profile page (/users/:username/) when a user has no unreleased or released learning objects.

The root cause was identified as attempting to access [0].abvName on potentially empty collectionsUnreleased or collectionsReleased arrays without proper guards.

Changes made:

• Added optional chaining (?.) to collectionsReleased[0].abvName in src/app/cube/user-profile/components/profile-learning-objects/profile-learning-objects.component.html (line 22) to prevent crashes when the 'Released Objects' tab is clicked and no released objects exist.
• Added optional chaining (?.) to collectionsUnreleased[0].abvName in src/app/cube/user-profile/components/profile-learning-objects/profile-learning-objects.component.html (line 33) to prevent crashes when the 'Draft' tab is clicked and no unreleased objects exist.
• Added optional chaining (?.) to collectionsReleased[0].abvName in src/app/cube/user-profile/components/profile-learning-objects/profile-learning-objects.component.ts (line 102) to prevent crashes during initial component load if no released objects are present.

These changes ensure that accessing abvName on an undefined object (resulting from [][0]) no longer throws a TypeError, making the user profile page more robust for users with empty collections.

Fixes CLARK-CLIENT-1T

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