Update app.py

app.py

@@ -156,11 +156,11 @@ def image_to_wd14_tags(image: Image.Image, model_name: str, threshold: float,
         tags_pairs = sorted(tags_pairs, key=lambda x: (-x[1], x[0]))
     for tag, score in tags_pairs:
         tag_outformat = tag
-        if use_spaces:
-            tag_outformat = tag_outformat.replace('_', ' ')
-            tag_outformat = tag_outformat.replace(' ', '-')
-        else:
+        if not use_spaces::
             tag_outformat = tag_outformat.replace('_', '-')
+        else
+            tag_outformat = tag_outformat.replace(' ', ', ')
+            tag_outformat = tag_outformat.replace('_', ' ')
         if use_escape:
             tag_outformat = re.sub(RE_SPECIAL, r'\\\1', tag_outformat)
         if include_ranks: