Check if decl context returned by importDeclContextOf is null #74214
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(cherry picked from commit fedf24c)
Explanation: I've seen a crash due to importDeclContextOf returning a null decl context in importAccessorParamsAndReturnType. Most other call sites of importDeclContextOf check the returned value, so I added a check in importAccessorParamsAndReturnType too.
Risk: Low. This just adds a nullptr check.
Testing: No new tests were added (as I've only seen this on an lldb crash report I'm not sure in what situation this would arise).
Issue: rdar://127847162
Reviewer: @beccadax
Original PR: #74188