Multiple no-label suggestions if there are multiple recommenders for different features on one layer

[reckart]

Describe the bug When there are multiple recommenders for different features of a single layer, it can lead to multiple "no label" suggestions being rendered - one for each feature.

To Reproduce Steps to reproduce the behavior:

1. Create span layer with two string features
2. Create string recommender for each of the features
3. Create an annotation on a word that repeats in the text
4. See that on the second occurrence of the text, two no-label suggestions are rendered (e.g. "(Span)")

Expected behavior Since both of the no-label suggestions have the same effect of just creating an empty span annotation, there is really no point of rendering both of them - they should be conflated.

Please complete the following information:

• Version and build ID: 38.4