Make timings more tolerant of corrupt chunks

Fixes GH-744

Spigot-API-Patches/Timings-v2.patch

@@ -671,7 +671,7 @@ index 00000000..916b6f9d
 +}
 diff --git a/src/main/java/co/aikar/timings/TimingHistory.java b/src/main/java/co/aikar/timings/TimingHistory.java
 new file mode 100644
-index 00000000..389875b3
+index 00000000..c2c2fb83
 --- /dev/null
 +++ b/src/main/java/co/aikar/timings/TimingHistory.java
 @@ -0,0 +0,0 @@
@@ -787,10 +787,20 @@ index 00000000..389875b3
 +                    RegionData data = regions.get(new RegionId(chunk.getX(), chunk.getZ()));
 +
 +                    for (Entity entity : chunk.getEntities()) {
++                        if (entity == null) {
++                            Bukkit.getLogger().warning("Null entity detected in chunk at position x: " + chunk.getX() + ", z: " + chunk.getZ());
++                            continue;
++                        }
++
 +                        data.entityCounts.get(entity.getType()).increment();
 +                    }
 +
 +                    for (BlockState tileEntity : chunk.getTileEntities()) {
++                        if (tileEntity == null) {
++                            Bukkit.getLogger().warning("Null tileentity detected in chunk at position x: " + chunk.getX() + ", z: " + chunk.getZ());
++                            continue;
++                        }
++
 +                        data.tileEntityCounts.get(tileEntity.getBlock().getType()).increment();
 +                    }
 +                }
@@ -3185,7 +3195,7 @@ index 00000000..5527e7c8
 +
 +}
 diff --git a/src/main/java/org/bukkit/command/SimpleCommandMap.java b/src/main/java/org/bukkit/command/SimpleCommandMap.java
-index cdf838eb..39b275cb 100644
+index 71709126..b886cd82 100644
 --- a/src/main/java/org/bukkit/command/SimpleCommandMap.java
 +++ b/src/main/java/org/bukkit/command/SimpleCommandMap.java
 @@ -0,0 +0,0 @@ public class SimpleCommandMap implements CommandMap {