fix(convert): Remove unnecessary safe dict get

#1250
Branch: BiasTensors-1250

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

Author: gabe-l-hart

torchchat/cli/convert_hf_checkpoint.py

@@ -142,7 +142,9 @@ def load_safetensors():
         if "layers" in key:
             abstract_key = re.sub(r"(\d+)", "{}", key)
             layer_num = re.search(r"\d+", key).group(0)
-            new_key = weight_map.get(abstract_key, abstract_key)
+            new_key = weight_map[abstract_key]
+            if new_key is None:
+                continue
             new_key = new_key.format(layer_num)
         else:
             new_key = weight_map[key]