io.pepxml: Fix inferring score when first spectrum_query items do not have search_hit items.

Author: RalfG

psm_utils/__init__.py

@@ -1,6 +1,6 @@
 """Common utilities for parsing and handling PSMs, and search engine results."""
 
-__version__ = "1.5.1"
+__version__ = "1.5.2"
 __all__ = ["Peptidoform", "PSM", "PSMList"]
 
 from warnings import filterwarnings

psm_utils/io/pepxml.py

@@ -73,6 +73,8 @@ def _infer_score_name(self) -> str | None:
         # Get scores from first PSM
         with pepxml.read(str(self.filename)) as reader:
             for spectrum_query in reader:
+                if "search_hit" not in spectrum_query:
+                    continue
                 score_keys = spectrum_query["search_hit"][0]["search_score"].keys()
                 break
             else: