fix: correct skip size for sparse switch payload

jadx-core/src/main/java/jadx/core/dex/instructions/args/ArgType.java

@@ -13,6 +13,7 @@ import jadx.core.dex.nodes.ClassNode;
 import jadx.core.dex.nodes.RootNode;
 import jadx.core.dex.visitors.typeinference.TypeCompareEnum;
 import jadx.core.utils.Utils;
+import jadx.core.utils.exceptions.JadxRuntimeException;
 
 public abstract class ArgType {
 	public static final ArgType INT = primitive(PrimitiveType.INT);
@@ -645,6 +646,9 @@ public abstract class ArgType {
 	}
 
 	public static ArgType parse(String type) {
+		if (type == null || type.isEmpty()) {
+			throw new JadxRuntimeException("Failed to parse type string: " + type);
+		}
 		char f = type.charAt(0);
 		switch (f) {
 			case 'L':

jadx-plugins/jadx-dex-input/src/main/java/jadx/plugins/input/dex/insns/DexInsnFormat.java

@@ -293,7 +293,7 @@ public abstract class DexInsnFormat {
 		@Override
 		public void skip(DexInsnData insn, SectionReader in) {
 			int size = in.readUShort();
-			in.skip(4 + size * 4 * 2);
+			in.skip(size * 8);
 			insn.setLength(size * 4 + 2);
 		}
 	};