Pressing Enter doesn't work in the taxonomy picker, if the OK button is also enabled

Steps to reproduce:

1. Go to the Events folder in HAP
2. Select a document
3. Click on Select taxonomy terms
4. Add a term (e.g. huge)
5. Search for door in the search field
6. Press Enter

Expected result:

Enter will act in this case as pressing on the search (loop) icon.

Actual result:

Enter is acting on the OK button. So, after pressing Enter the user will not actually search but exit the Taxonomy picker dialog.