config: Reraise ConfigError from ConfigObjError.

Closes #8801

dvc/config.py

@@ -169,7 +169,7 @@ class Config(dict):
         return self.fs if level == "repo" else self.wfs
 
     def _load_config(self, level):
-        from configobj import ConfigObj
+        from configobj import ConfigObj, ConfigObjError
 
         filename = self.files[level]
         fs = self._get_fs(level)
@@ -180,6 +180,8 @@ class Config(dict):
                     conf_obj = ConfigObj(fobj)
                 except UnicodeDecodeError as exc:
                     raise ConfigError(str(exc)) from exc
+                except ConfigObjError as exc:
+                    raise ConfigError(str(exc)) from exc
         else:
             conf_obj = ConfigObj()
         return _parse_named(_lower_keys(conf_obj.dict()))

tests/unit/test_config.py

@@ -81,3 +81,16 @@ def test_load_unicode_error(tmp_dir, dvc, mocker):
     with pytest.raises(ConfigError):
         with config.edit():
             pass
+
+
+def test_load_configob_error(tmp_dir, dvc, mocker):
+    from configobj import ConfigObjError
+
+    config = Config(validate=False)
+    mocker.patch(
+        "configobj.ConfigObj",
+        side_effect=ConfigObjError(),
+    )
+    with pytest.raises(ConfigError):
+        with config.edit():
+            pass