Fix NRE in CompSuppressable.IsHunkering when pawn.CurJob is null

[WhiteGiverMa]

Changes

Add null-conditional access (pawn.CurJob?.def) in CompSuppressable.IsHunkering to prevent NullReferenceException when a pawn enters the hunkering recovery path with no current job.

Reasoning

CompSuppressable.IsHunkering has a recovery path that runs when a pawn has suppression buildup but isSuppressed == false (an abnormal but possible state). In this path, it checks if the pawn currently has a HunkerDown job by accessing pawn.CurJob.def. However, pawn.CurJob can be null when the pawn is idle or between jobs, causing NullReferenceException.

Stack trace:

Exception ticking XXX: System.NullReferenceException
  at CombatExtended.CompSuppressable.get_IsHunkering()
  at CombatExtended.CompTacticalManager.TryGiveTacticalJobs()
  at CombatExtended.CompTacticalManager.CompTickRare()
  at Verse.ThingWithComps.TickRare()
  at Verse.Pawn.Tick()

The same codebase already uses this null-check pattern in ExternalPawnDrafter.cs:11:

(pawn.CurJob == null || pawn.CurJob.def.playerInterruptible)

Alternatives

Could use pawn.CurJob != null && pawn.CurJob.def == ... instead of ?., but the null-conditional operator is more concise and already in use elsewhere in the CE codebase.

Testing

• Compiles without warnings (dotnet build -c Release: 0 warnings, 0 errors)
• Game runs without errors
• (For compatibility patches) ...with and without patched mod loaded
• Playtested a colony (45 days)

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-28716298666.zip