return null as stack if it jumps

git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@535 379699f6-c40d-0410-875b-85095c16579e

jode/jode/flow/ConditionalBlock.java

@@ -103,8 +103,10 @@ public class ConditionalBlock extends InstructionContainer {
 	    newStack = stack;
 
 	trueBlock.jump.stackMap = newStack;
-	if (jump != null)
+	if (jump != null) {
 	    jump.stackMap = newStack;
+	    return null;
+	}
 	return newStack;
     }