Fix attachments picker popover crash

[mvasilak]

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Description of the pull request

Fixes a crash that occurs in iPad when the ChatMessageComposerVC attempts to present the attachment picker.

[codecov]

Codecov Report

Merging #977 (5aba9f4) into main (d8f43bb) will decrease coverage by 0.02%.
The diff coverage is 90.38%.

@@            Coverage Diff             @@
##             main     #977      +/-   ##
==========================================
- Coverage   89.62%   89.59%   -0.03%     
==========================================
  Files         210      211       +1     
  Lines        8739     8768      +29     
==========================================
+ Hits         7832     7856      +24     
- Misses        907      912       +5     

Flag	Coverage Δ
llc-tests	89.59% <90.38%> (-0.03%)	⬇️
llc-tests-ios12	85.88% <78.84%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Sources/StreamChat/Models/Channel.swift	73.91% <83.33%> (ø)
Sources/StreamChat/Utils/CoreDataLazy.swift	87.50% <87.50%> (ø)
Sources/StreamChat/Database/DTOs/MessageDTO.swift	95.44% <92.85%> (-0.24%)	⬇️
Sources/StreamChat/Database/DTOs/ChannelDTO.swift	98.95% <100.00%> (+<0.01%)	⬆️
Sources/StreamChat/Models/Message.swift	88.09% <100.00%> (ø)
Sources/StreamChat/Utils/Cached.swift	76.47% <0.00%> (-5.89%)	⬇️

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[b-onc]

Closing this due to #1060 but thanks a lot, @mvasilak ! We'll add you to the CHANGELOG entry for this issue.