Instagram / IGListKit / 19446073239

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Fix EXC_BAD_ACCESS crash in IGListSectionMap.m during IGListAdapter deallocation

Summary:
## Initial Devmate Prompt:
[https://www.internalfb.com/logview/basel\_ios\_crashes/cdf37c300a6041eebafd4aa2c2ed9846](https://www.internalfb.com/logview/basel_ios_crashes/cdf37c300a6041eebafd4aa2c2ed9846)

What's the issue that's causing this FAD?

Can you create a fix for it?
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## LLM-generated Summary:
The changes fix a crash in IGListSectionMap.m that occurs during IGListAdapter deallocation. The issue is caused by accessing a nil or invalid sectionController, which is resolved by adding a nil check before invoking the block. This fix prevents the crash when section controllers are no longer available in the map during cleanup, ensuring a safe and defensive programming approach to handle the race condition during deallocation.
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Session: DEV17393008

Differential Revision: D87261228

fbshipit-source-id: 8c147909b

5 of 5 new or added lines in 1 file covered. (100.0%)

4340 of 4525 relevant lines covered (95.91%)

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