prevent npe and log bad requests (#55)

src/main/java/binnie/genetics/machine/isolator/IsolatorComponentLogic.java

@@ -4,6 +4,9 @@ import java.util.Random;
 
 import net.minecraft.item.ItemStack;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
 import binnie.core.genetics.Gene;
 import binnie.core.machines.Machine;
 import binnie.core.machines.inventory.IChargedSlots;
@@ -20,6 +23,8 @@ import forestry.api.genetics.ISpeciesRoot;
 
 public class IsolatorComponentLogic extends ComponentProcessSetCost implements IProcess {
 
+    private static final Logger LOG = LogManager.getLogger("Genetics");
+
     protected float enzymePerProcess = 0.5f;
     protected float ethanolPerProcess = 10.0f;
 
@@ -79,8 +84,21 @@ public class IsolatorComponentLogic extends ComponentProcessSetCost implements I
 
         final IChromosomeType[] karyo = root.getKaryotype();
         final IChromosomeType chromosome = karyo[rand.nextInt(karyo.length)];
-        final IAllele allele = rand.nextBoolean() ? individual.getGenome().getActiveAllele(chromosome)
-                : individual.getGenome().getInactiveAllele(chromosome);
+        final IAllele allele;
+        try {
+            allele = rand.nextBoolean() ? individual.getGenome().getActiveAllele(chromosome)
+                    : individual.getGenome().getInactiveAllele(chromosome);
+        } catch (NullPointerException npe) {
+            // just return and eat the power without eating the rest of it
+            LOG.warn(
+                    "NPE occurred on unknown gene: name: " + chromosome.getName()
+                            + " | ordinal: "
+                            + chromosome.ordinal()
+                            + " | is null? "
+                            + (individual.getGenome().getChromosomes()[chromosome.ordinal()] == null ? "true"
+                                    : "false"));
+            return;
+        }
         final Gene gene = new Gene(allele, chromosome, root);
 
         ItemStack serum = ItemSequence.create(gene);