fix: avoid crash on YAML files ruamel.yaml can not parse

Fixes WEBLATE-19Q6

CHANGES.rst

@@ -5,6 +5,7 @@ Changelog
 ----
 
 * Not yet released.
+* Fixed crasn on corrupt YAML files.
 
 2.18
 ----

translation_finder/discovery/files.py

@@ -8,6 +8,7 @@
 
 import json
 import re
+import warnings
 from typing import TYPE_CHECKING
 
 from ruamel.yaml import YAML
@@ -423,6 +424,11 @@ def adjust_format(self, result: ResultDict) -> None:
                 data = yaml.load(handle)
             except (YAMLError, YAMLFutureWarning):
                 return
+            except Exception as error:  # noqa: BLE001
+                # Weird errors can happen when parsing YAML, handle them gracefully, but
+                # emit a warning
+                warnings.warn(f"Could not parse YAML: {error}", stacklevel=0)
+                return
             if isinstance(data, dict) and len(data) == 1:
                 key = next(iter(data.keys()))
                 if "filemask" in result: