[REG 3.5.1 -> 3.6.0] Events tab not being cleared on first click on "Discard data"

1. Open a Qt Quick Application project.
2. Run the project in the QML Profiler.
3. Stop the project.
   The Analyzer will gather some data.
4. Go to Events tab.
5. Click the "Discard data" button.
   The Events list will still contain one line:

   Location	Type	Time in Percent	Total Time	Calls	Mean Time	Median Time	Longest Time	Shortest Time	Details
   <program>		100.00 %	0.001 µs	1	0.001 µs	0.001 µs	0.001 µs	0.001 µs	Main Program
   

6. Click the "Discard data" button.
   Now the table will be empty.

The table should be cleared on first click. In Creator 3.5.1, this works correctly.

Found and tested by Squish test tst_simple_analyze.