Empty notes and tags now return null values

src/filters.cc

@@ -69,6 +69,7 @@ void post_splitter::operator()(post_t& post)
   bind_scope_t bound_scope(report, post);
   value_t      result(group_by_expr.calc(bound_scope));
 
+  if (! result.is_null()) {
     value_to_posts_map::iterator i = posts_map.find(result);
     if (i != posts_map.end()) {
       (*i).second.push_back(&post);
@@ -78,6 +79,7 @@ void post_splitter::operator()(post_t& post)
       assert(inserted.second);
       (*inserted.first).second.push_back(&post);
     }
+  }
 }
 
 pass_down_posts::pass_down_posts(post_handler_ptr handler,
@@ -837,6 +839,7 @@ void transfer_details::operator()(post_t& post)
   bind_scope_t bound_scope(scope, temp);
   value_t      substitute(expr.calc(bound_scope));
 
+  if (! substitute.is_null()) {
     switch (which_element) {
     case SET_DATE:
       temp.xdata().date = substitute.to_date();
@@ -873,6 +876,7 @@ void transfer_details::operator()(post_t& post)
       assert(false);
       break;
     }
+  }
 
   item_handler<post_t>::operator()(temp);
 }

src/item.cc

@@ -227,7 +227,7 @@ namespace {
     return NULL_VALUE;
   }
   value_t get_note(item_t& item) {
-    return string_value(item.note ? *item.note : empty_string);
+    return item.note ? string_value(*item.note) : NULL_VALUE;
   }
 
   value_t has_tag(call_scope_t& args) {
@@ -260,7 +260,8 @@ namespace {
     return false;
   }
 
-  value_t get_tag(call_scope_t& args) {
+  value_t get_tag(call_scope_t& args)
+  {
     item_t& item(find_scope<item_t>(args));
     optional<string> str;
 
@@ -292,14 +293,14 @@ namespace {
     if (str)
       return string_value(*str);
     else
-      return string_value(empty_string);
+      return NULL_VALUE;
   }
 
   value_t get_pathname(item_t& item) {
     if (item.pos)
       return string_value(item.pos->pathname.string());
     else
-      return string_value(empty_string);
+      return NULL_VALUE;
   }
 
   value_t get_beg_pos(item_t& item) {

src/post.cc

@@ -150,7 +150,7 @@ namespace {
     if (post.xact->code)
       return string_value(*post.xact->code);
     else
-      return string_value(empty_string);
+      return NULL_VALUE;
   }
 
   value_t get_payee(post_t& post) {
@@ -158,9 +158,13 @@ namespace {
   }
 
   value_t get_note(post_t& post) {
+    if (post.note || post.xact->note) {
       string note = post.note ? *post.note : empty_string;
       note += post.xact->note ? *post.xact->note : empty_string;
       return string_value(note);
+    } else {
+      return NULL_VALUE;
+    }
   }
 
   value_t get_magnitude(post_t& post) {

src/xact.cc

@@ -468,7 +468,7 @@ namespace {
     if (xact.code)
       return string_value(*xact.code);
     else
-      return string_value(empty_string);
+      return NULL_VALUE;
   }
 
   value_t get_payee(xact_t& xact) {

test/baseline/opt-code-as-payee.test

@@ -28,7 +28,7 @@ reg --payee=code
 08-Feb-01 102                   Assets:Cash                 $-20.00            0
 08-Feb-28 103                   Expenses:Books               $20.00       $20.00
 08-Feb-28 103                   Assets:Cash                 $-20.00            0
-08-Mar-01                       Expenses:Books               $30.00       $30.00
-08-Mar-01                       Assets:Cash                 $-30.00            0
+08-Mar-01 March                 Expenses:Books               $30.00       $30.00
+08-Mar-01 March                 Assets:Cash                 $-30.00            0
 >>>2
 === 0