fix a panic in HandleRecoverDealIDs

[magik6k]

The check below is new, but apparently could cause a panic

[codecov]

Codecov Report

Merging #7336 (438d5ce) into release/v1.11.3 (5db02ca) will increase coverage by 5.25%.
The diff coverage is 0.00%.

@@                 Coverage Diff                 @@
##           release/v1.11.3    #7336      +/-   ##
===================================================
+ Coverage            33.89%   39.14%   +5.25%     
===================================================
  Files                  608      614       +6     
  Lines                64695    64986     +291     
===================================================
+ Hits                 21927    25439    +3512     
+ Misses               38662    35143    -3519     
- Partials              4106     4404     +298     

Impacted Files	Coverage Δ
extern/storage-sealing/states_failed.go	11.20% <0.00%> (-0.15%)	⬇️
chain/actors/builtin/paych/paych.go	16.88% <0.00%> (-5.20%)	⬇️
storage/wdpost_changehandler.go	97.64% <0.00%> (-0.95%)	⬇️
extern/sector-storage/sched_worker.go	77.25% <0.00%> (-0.73%)	⬇️
miner/miner.go	55.96% <0.00%> (-0.67%)	⬇️
chain/actors/builtin/miner/v5.go	53.53% <0.00%> (-0.31%)	⬇️
storage/wdpost_sched.go	79.20% <0.00%> (ø)
journal/mockjournal/journal.go	71.42% <0.00%> (ø)
chain/types/mock/chain.go	86.66% <0.00%> (ø)
chain/actors/builtin/paych/mock/mock.go	64.28% <0.00%> (ø)
... and 137 more

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