Fix NPE in V3808

The armor items may not exist, so we need to null check it.

patches/server/0971-Rewrite-dataconverter-system.patch

@@ -22083,7 +22083,7 @@ index 0000000000000000000000000000000000000000..a76916cdb7cf91b8ba5461524472b3e4
 +}
 diff --git a/src/main/java/ca/spottedleaf/dataconverter/minecraft/versions/V3808.java b/src/main/java/ca/spottedleaf/dataconverter/minecraft/versions/V3808.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..22b7bf301c8ab7cde285fa257f240986a697b83f
+index 0000000000000000000000000000000000000000..78a10f89218eb0edf121f88978b4fe13e1b1bf44
 --- /dev/null
 +++ b/src/main/java/ca/spottedleaf/dataconverter/minecraft/versions/V3808.java
 @@ -0,0 +1,82 @@
@@ -22133,12 +22133,12 @@ index 0000000000000000000000000000000000000000..22b7bf301c8ab7cde285fa257f240986
 +
 +                if (this.clearArmor) {
 +                    final ListType armor = data.getList("ArmorItems", ObjectType.MAP);
-+                    if (armor.size() > 2) {
++                    if (armor != null && armor.size() > 2) {
 +                        armor.setMap(2, data.getTypeUtil().createEmptyMap());
 +                    }
 +
 +                    final ListType chances = data.getList("ArmorDropChances", ObjectType.FLOAT);
-+                    if (chances.size() > 2) {
++                    if (chances != null && chances.size() > 2) {
 +                        chances.setFloat(2, 0.085F);
 +                    }
 +                }