When trying to remove a Test Execution in a non-editable status from a Test Plan, the History entry is created

Description
When trying to remove a Test Execution(TE) in a non-editable status from a Test Plan(TP):

• the "Delete association with Test Execution" warning appears;
• the TE is not removed from the TP, as it should;
• the History entry is created.

Pre-conditions
The associated TE must be in a non-editable workflow status.

How to reproduce

1. Enter the TP, and Remove the TE:
   
2. Press "Delete" on the warning:
   

Actual result/Attachments
The TE remains on the TP CORRECT;
You see the "Delete association with Test Execution" warning;
The History entry is created:

Expected result
The TE remains on the TP CORRECT;
You don't see the "Delete association with Test Execution" warning;
The History entry is not created.