normalize-usercode: allow changes in get_sample signature

devtools/code-tools/normalize-usercode.py

@@ -30,9 +30,8 @@ def restitute_sample(ti, tc):
     if not mn:
         raise Exception("Normalized code has no function get_sample")
     if mn.group(2) != header:
-        raise Exception(
-            f'Signature of function get_sample has changed from "{header}" to "{mn.group(1)}"'
-        )
+        print(f'WARNING: Signature of function get_sample has changed from "{header}" to '
+              '"{mn.group(1)}"')
 
     t = re.sub(pat, mi.group(1), tc)