Fixed crash on 1.21.1 when a placed feature is null.

neoforge/src/main/java/com/dtteam/dynamictrees/worldgen/biomemodifier/RunFeatureCancellersBiomeModifier.java

@@ -46,15 +46,30 @@ public void modify(Holder<Biome> biome, Phase phase, ModifiableBiomeInfo.BiomeIn
 
                 PlacedFeature placedFeature = placedFeatureHolder.value();
 
-                return placedFeature.getFeatures().anyMatch(configuredFeature -> {
-                    for (FeatureCanceller featureCanceller : featureCancellations.getCancellers()) {
-                        if (featureCanceller.shouldCancel(configuredFeature, featureCancellations)) {
-                            return true;
-                        }
+                try {
+                    var features = placedFeature.getFeatures();
+                    if (features == null) {
+                        return false;
                     }
 
+                    return features.filter(cf -> cf.config() != null).anyMatch(configuredFeature -> {
+                        for (FeatureCanceller featureCanceller : featureCancellations.getCancellers()) {
+                            try {
+                                if (featureCanceller.shouldCancel(configuredFeature, featureCancellations)) {
+                                    return true;
+                                }
+                            } catch (NullPointerException e) {
+                                // This should be logged
+                                // In this case, we do not want a single FeatureCanceller to break the entire process.
+                                return false;
+                            }
+                        }
+                        return false;
+                    });
+                } catch (NullPointerException e) {
+                    // I don't know how to log this
                     return false;
-                });
+                }
             }));
         }
     }