Add resistance to MultiItems to prevent crashes from invalid stacks.

core/Registration.java

@@ -208,6 +208,10 @@ public class Registration
 		for (MaterialType mat : MaterialType.values())
 		{
 			try
+			{
+				if ( mat == MaterialType.InvalidType )
+					((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
+				else
 				{
 					Field f = materialClass.getField( "material" + mat.name() );
 					ItemStackSrc is = ((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
@@ -216,6 +220,7 @@ public class Registration
 					else
 						f.set( materials, new NullItemDefinition() );
 				}
+			}
 			catch (Throwable err)
 			{
 				AELog.severe( "Error creating material: " + mat.name() );
@@ -229,6 +234,10 @@ public class Registration
 		for (PartType type : PartType.values())
 		{
 			try
+			{
+				if ( type == PartType.InvalidType )
+					((ItemMultiPart) partItem.item()).createPart( type, null );
+				else
 				{
 					Field f = partClass.getField( "part" + type.name() );
 					Enum varients[] = type.getVarients();
@@ -257,6 +266,7 @@ public class Registration
 						}
 					}
 				}
+			}
 			catch (Throwable err)
 			{
 				AELog.severe( "Error creating part: " + type.name() );

items/materials/ItemMultiMaterial.java

@@ -166,7 +166,7 @@ public class ItemMultiMaterial extends AEBaseItem implements IStorageComponent,
 	{
 		if ( dmgToMaterial.containsKey( is.getItemDamage() ) )
 			return dmgToMaterial.get( is.getItemDamage() );
-		return null;
+		return MaterialType.InvalidType;
 	}
 
 	@Override

items/materials/MaterialType.java

@@ -17,6 +17,8 @@ import cpw.mods.fml.relauncher.SideOnly;
 
 public enum MaterialType
 {
+	InvalidType(-1, AEFeature.Core),
+
 	CertusQuartzCrystal(0, AEFeature.Core, "crystalCertusQuartz"), CertusQuartzCrystalCharged(1, AEFeature.Core, EntityChargedQuartz.class),
 
 	CertusQuartzDust(2, AEFeature.Core, "dustCertusQuartz"), NetherQuartzDust(3, AEFeature.Core, "dustNetherQuartz"), Flour(4, AEFeature.Flour, "dustWheat"), GoldDust(

items/parts/PartType.java

@@ -39,6 +39,8 @@ import appeng.parts.reporting.PartTerminal;
 
 public enum PartType
 {
+	InvalidType(-1, AEFeature.Core, null),
+
 	CableGlass(0, AEFeature.Core, PartCableGlass.class),
 
 	CableCovered(20, AEFeature.Core, PartCableCovered.class),