use the value '%nothing%' only in talogo, and None elsewhere

2 files changed, 2 insertions, 2 deletions

diff --git a/TurtleArt/tablock.py b/TurtleArt/tablock.py
index e878a46..be1c718 100644
--- a/TurtleArt/tablock.py
+++ b/TurtleArt/tablock.py
@@ -310,7 +310,7 @@ class Block:
         elif self.name in media_blocks_dictionary:
             return '#smedia_' + self.name.upper()
         else:
-            return '%nothing%'
+            return None
 
     def highlight(self):
         """ We may want to highlight a block... """
diff --git a/TurtleArt/talogo.py b/TurtleArt/talogo.py
index c6991bd..3e9b089 100644
--- a/TurtleArt/talogo.py
+++ b/TurtleArt/talogo.py
@@ -289,7 +289,7 @@ class LogoCode:
                 code.append(blk.primitive)  # Hidden block
         elif blk.is_value_block():  # Extract the value from content blocks.
             value = blk.get_value()
-            if value == '%nothing%':
+            if value is None:
                 return ['%nothing%']
             else:
                 code.append(value)