Fix unparse for empty initializer or conditionStatement.

frog/tests/leg/unparser_test.dart

Index: frog/tests/leg/unparser_test.dart
diff --git a/frog/tests/leg/unparser_test.dart b/frog/tests/leg/unparser_test.dart
index 4833123898b806a9c9b894ba0f65d579d0ddd2e8..1db130441fbe9071b312e515cde5954dc791d014 100644
--- a/frog/tests/leg/unparser_test.dart
+++ b/frog/tests/leg/unparser_test.dart
@@ -17,6 +17,12 @@ testGenericTypes() {
   testUnparse('var x=new List<List<List<List<List<int>>>>>();');
 }
 
+testForLoop() {
+  testUnparse('for(;i<100;i++){}');
+  testUnparse('for(i=0;i<100;i++){}');
+}
+
 main() {
   testGenericTypes();
+  testForLoop();
 }