Return immediately in some cases instead of using the result list

I like it better now, but I still dislike it; We need to rewrite the entire function

stdplugins/info.py

@@ -33,8 +33,9 @@ def yaml_format(obj, indent=0):
         obj = obj.to_dict()
 
     if isinstance(obj, dict):
+        if not obj:
+            return 'dict:'
         result.append(obj.get('_', 'dict') + ':')
-        if obj:
         items = obj.items()
         has_multiple_items = len(items) > 2
         if has_multiple_items:
@@ -54,21 +55,20 @@ def yaml_format(obj, indent=0):
         result.append(' ' * indent)
     elif isinstance(obj, str):
         # truncate long strings and display elipsis
-        result.append(repr(obj[:STR_LEN_MAX]))
+        result = repr(obj[:STR_LEN_MAX])
         if len(obj) > STR_LEN_MAX:
-            result.append('…')
+            result += '…'
+        return result
     elif isinstance(obj, bytes):
         # repr() bytes if it's printable, hex like "FF EE BB" otherwise
         if all(c in PRINTABLE_SET for c in obj):
-            result.append(repr(obj))
+            return repr(obj)
         else:
-            if len(obj) > BYTE_LEN_MAX:
-                result.append('<…>')
-            else:
-                result.append(' '.join(f'{b:02X}' for b in obj))
+            return ('<…>' if len(obj) > BYTE_LEN_MAX else
+                    ' '.join(f'{b:02X}' for b in obj))
     elif isinstance(obj, datetime.datetime):
         # ISO-8601 without timezone offset (telethon dates are always UTC)
-        result.append(obj.strftime('%Y-%m-%d %H:%M:%S'))
+        return obj.strftime('%Y-%m-%d %H:%M:%S')
     elif hasattr(obj, '__iter__'):
         # display iterables one after another at the base indentation level
         result.append('\n')
@@ -80,7 +80,7 @@ def yaml_format(obj, indent=0):
         indent -= 2
         result.append(' ' * indent)
     else:
-        result.append(repr(obj))
+        return repr(obj)
 
     return ''.join(result)