fix: scope input-scanning loop inside per-node try/except in extract_models_from_prompt

If INPUT_TYPES() succeeded but returned a non-dict, the inner loop
calling input_types.get() would raise AttributeError outside the guard,
aborting model tracking for the entire prompt. Moving the loop inside
the try/except means only the offending node is skipped via continue.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mapper.py

@@ -159,9 +159,6 @@ class ModelMapper:
 
             try:
                 input_types = node_cls.INPUT_TYPES()
-            except Exception:
-                continue
-
                 for category in ("required", "optional"):
                     for input_name, input_def in input_types.get(category, {}).items():
                         if not isinstance(input_def, (list, tuple)) or not input_def:
@@ -176,6 +173,8 @@ class ModelMapper:
                         if model_type:
                             seen.add(value)
                             results.append((value, model_type))
+            except Exception:
+                continue
 
         return results