fix failure to handle otherwise blocks with multiple expressions

src/kiss/SpecialForms.hx

@@ -273,10 +273,11 @@ class SpecialForms {
             // Therefore only one case is required in a case statement, because one case could be enough
             // to cover all patterns.
             wholeExp.checkNumArgs(2, null, '(case [expression] [cases...] [optional: (otherwise [default])])');
+            var b = wholeExp.expBuilder();
             var defaultExpr = switch (args[-1].def) {
-                case CallExp({pos: _, def: Symbol("otherwise")}, [otherwiseExp]):
+                case CallExp({pos: _, def: Symbol("otherwise")}, otherwiseExps):
                     args.pop();
-                    k.convert(otherwiseExp);
+                    k.convert(b.begin(otherwiseExps));
                 default:
                     null;
             };

src/test/cases/BasicTestCase.kiss

@@ -378,7 +378,12 @@
         ((Some (as inner (Some v)))
             (Assert.equals 5 v)
             (Assert.isTrue (Type.enumEq (Some 5) inner)))
-        (otherwise (Assert.fail))))
+        (otherwise (Assert.fail)))
+    
+    // Otherwise blocks should allow multiple expressions, too:
+    (case 5
+        (otherwise
+            6 5)))
 
 (function _testMaps []
     (localVar :Map<String,String> myMap [=>"hey" "you"