Crash Due to Random Access Violation Error in OutputPlotOptionsView::setIndices

[MohamedAlmaki]

Describe the bug
An Access Violation Exception in the OutputPlotOptionsView::setIndices function occurs when using ISIS Calibration and ISIS Diagnostics interfaces. The error happens randomly, and only a few people have been able to reproduce it, mainly on Windows. I don't know why it happens, but it could be related to the signal blocker. Found during manual testing in #37985

To Reproduce

In ISIS Calibration:

1. Open Interfaces > Indirect > Data reduction
2. Make sure Instrument is set to IRIS
3. Go to the ISIS calibration
4. Enter Input Runs 26173
5. Click Run
6. This should generate a workspace with _calib at the end, delete this workspace
7. Check the Scale by factor checkbox and change the value of the scale to 0.5
8. Click Run
9. This should generate a workspace with _calib
10. Check the Create RES box
11. Click Run
12. This should generate a workspace with _res at the end
13. Freeze and crash!

In ISIS Diagnostics:

1. On ISIS Diagnostics
2. Load 26176 for sample.
3. Use 26173 for calibration from previous test.
4. Tick Use Two ranges.
5. Widen the start and end of the Peak region.
6. Move the background region to the end of the spectrum.
7. Click Run
8. Freeze and crash!

Expected behavior

No Crash Happen

Platform/Version (please complete the following information):

• OS: Windows
• OS Version: 10 Enterprise
• Mantid Version [e.g. 6.0.0] 6.11 RC