If there are course custom fields of type "textarea" with option "Required" = "No" and they are left empty, their labels are always shown in category course list and in course/info.php page.
It could be related to https://tracker.moodle.org/browse/MDL-79365.

Steps to reproduce:

1. Log in as admin
2. Navigate to Courses > Course custom fields in site administration
3. Add a new category (if none exists)
4. Add a new Text area field
   • Name: Program
   • Shortname: program
   • Required: No
5. Add a new Short Text field
   • Name: Level
   • Short name: level
   • Required: No
6. Create a new course "Test"
   • Fill in required fields
   • Leave the Program textarea field blank
   • Leave the Level short text field blank
   • Save the course

Navigating to course/index.php page (or in course/index.php?categoryid="id of category the course Test belongs to"):

•     in "Test" coursebox the label "Level" is not present (correct beahviour)
•     in "Test" coursebox the label "Program" is present (incorrect beahviour)
     

Same behaviour in page course/info.php?id="Test course id"