diff --git a/api/s23_options.py b/api/s23_options.py
index 50d0b97..43e6ada 100644
--- a/api/s23_options.py
+++ b/api/s23_options.py
@@ -143,28 +143,29 @@ def set_option(name: str, cs: ChangeSet) -> ChangeSet:
 # MAP                 filename
 #--------------------------------------------------------------
 def inp_in_option(section: list[str]) -> ChangeSet:
-    if len(section) > 0:
-        cs = g_update_prefix | { 'type' : 'option' }
-        for s in section:
-            if s.startswith(';'):
-                continue
+    if len(section) <= 0:
+        return ChangeSet()
 
-            tokens = s.strip().split()
-            if tokens[0].upper() == 'PATTERN': # can not upper id
-                cs |= { 'PATTERN' : tokens[1] }
-            elif tokens[0].upper() == 'QUALITY': # can not upper trace node
-                value = tokens[1]
-                if len(tokens) > 2:
-                    value += f' {tokens[2]}'
-                cs |= { 'QUALITY' : value }
-            else:
-                line = s.upper().strip()
-                for key in get_option_schema('').keys():
-                    if line.startswith(key):
-                        value = line.removeprefix(key).strip()
-                        cs |= { key : value }
-        return ChangeSet(cs)
-    return ChangeSet()
+    cs = g_update_prefix | { 'type' : 'option' }
+    for s in section:
+        if s.startswith(';'):
+            continue
+
+        tokens = s.strip().split()
+        if tokens[0].upper() == 'PATTERN': # can not upper id
+            cs |= { 'PATTERN' : tokens[1] }
+        elif tokens[0].upper() == 'QUALITY': # can not upper trace node
+            value = tokens[1]
+            if len(tokens) > 2:
+                value += f' {tokens[2]}'
+            cs |= { 'QUALITY' : value }
+        else:
+            line = s.upper().strip()
+            for key in get_option_schema('').keys():
+                if line.startswith(key):
+                    value = line.removeprefix(key).strip()
+                    cs |= { key : value }
+    return ChangeSet(cs)
 
 
 def inp_out_option(name: str) -> list[str]: