Reproduction steps:
1. Open attached project
2. Open the "Fade Color" scene (located in Assets\Scenes)
3. Open the animation window and click on the "TextMeshPro" gameObject
4. Click on the "Add Property" button
5. Notice there isn't any TextMeshPro component (check ReproScreen.png)

Actual result: Animation Window doesn't detect TextMeshPro component in Add Property.

Expected result: Animation Window should detect TextMeshPro component in Add Property.

Notes:
- Cannot test the issue on 5.4, because Unity crashes on GrayscaleFilterEffect::RenderGrayscaleFade (known issue)
- In 5.1 the script seems to be missing, but is still detects that there should be some component (check ReproScreen.png)

Regression introduced in: 5.2