fix a bug which is converting from for(;;) to while()

src/org/jetbrains/jet/j2k/ast/Block.kt

@@ -4,7 +4,7 @@ import java.util.LinkedList
 
 public open class Block(val statements: List<Element>, val notEmpty: Boolean = false): Statement() {
     public override fun isEmpty(): Boolean {
-        return !notEmpty && statements.size() == 0
+        return !notEmpty && (statements.size() == 0  || statements.all { it == Statement.EMPTY_STATEMENT })
     }
 
     public override fun toKotlin(): String {

src/org/jetbrains/jet/j2k/visitors/StatementVisitor.kt

@@ -99,9 +99,13 @@ public open class StatementVisitor(converter: Converter): ElementVisitor(convert
         else {
             var forStatements = ArrayList<Element>()
             forStatements.add(getConverter().statementToStatement(initialization))
-            forStatements.add(WhileStatement(getConverter().expressionToExpression(condition),
-                    Block(arrayList(getConverter().statementToStatement(body),
-                            Block(arrayList(getConverter().statementToStatement(update)), false)), false)))
+            forStatements.add(WhileStatement(
+                if (condition == null)
+                    LiteralExpression("true")
+                else
+                    getConverter().expressionToExpression(condition)
+                , Block(arrayListOf(getConverter().statementToStatement(body),
+                    Block(arrayListOf(getConverter().statementToStatement(update)), false)), false)))
             myResult = Block(forStatements, false)
         }
     }

tests/testData/ast/for/statement/forWithNullCondition.jav

@@ -0,0 +1 @@
+for (init(); ; update()) body();

tests/testData/ast/for/statement/forWithNullCondition.kt

@@ -0,0 +1,10 @@
+{
+init()
+while (true)
+{
+body()
+{
+update()
+}
+}
+}

tests/testData/ast/for/statement/forWithNullInit.jav

@@ -0,0 +1 @@
+for (; condition() ; update()) body();

tests/testData/ast/for/statement/forWithNullInit.kt

@@ -0,0 +1,9 @@
+{
+while (condition())
+{
+body()
+{
+update()
+}
+}
+}

tests/testData/ast/for/statement/forWithNullUpdate.jav

@@ -0,0 +1 @@
+for (init(); condition(); ) body();

tests/testData/ast/for/statement/forWithNullUpdate.kt

@@ -0,0 +1,7 @@
+{
+init()
+while (condition())
+{
+body()
+}
+}