dart: Fix crash on yaml parser error

swh/indexer/metadata_dictionary/base.py

@@ -400,7 +400,7 @@ class YamlMapping(DictMapping):
         raw_content_string: str = raw_content.decode()
         try:
             content_dict = yaml.load(raw_content_string, Loader=SafeLoader)
-        except yaml.scanner.ScannerError:
+        except (yaml.scanner.ScannerError, yaml.parser.ParserError):
             return None
 
         if isinstance(content_dict, dict):

swh/indexer/tests/metadata_dictionary/test_dart.py

@@ -148,3 +148,14 @@ def test_normalize_empty_authors():
     }
 
     assert result == expected
+
+
+def test_invalid_yaml():
+    raw_content = b"""
+    name: smartech_push
+    license: { :type => "Commercial", :file => "LICENSE" }
+    """
+
+    result = MAPPINGS["PubMapping"]().translate(raw_content)
+
+    assert result is None