When lectures are not named, you can not click them on list view

[barisgul15]

Describe the bug
For the courses which's lectures are not named, there is no link to click so that user can watch the lecture. Normal view still shows the lectures, but when list view is selected, there is only writing on the screen.

To Reproduce
Steps to reproduce the behavior:
Click any course which's lectures are not named and click list view. For example; Advanced Topics of Software Engineering (IN2309, IN2126), Approximation Algorithms [CIT4100003], Automaten und formale Sprachen (IN2041), etc.

Expected behavior
When list view is selected, and when the lecture is clicked, the video player should open to that users can watch the lecture.

Screenshots
A course with named lectures in list view:

A course without named lectures in list view:

A course without named lectures in normal view:

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.