Error message repeats twice the name of element when no input data

Scenario:

1. Add "Improve Reads with Trimmomatic" element.
2. Add a trimming step.
3. Validate the workflow.
   Expected state: there is an error message:

   Improve reads with Trimmomatic: The mandatory slot <...> is not connected.
   

   Actual state: the error message is the following:

   Improve reads with Trimmomatic: Improve reads with Trimmomatic : The mandatory slot <...> is not connected