Fix bug when default config paths do not exist

when fetching initial path listing, to create config object.  should
only affect situations where default file paths are needed, i.e. when
caller does not specify

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Changed
+- Fix bug when default config paths do not exist.
 
 ## [0.1.11] - 2024-04-14
 ### Changed

src/wuttjamaican/conf.py

@@ -777,6 +777,8 @@ def get_config_paths(
                 files = [default_files]
             else:
                 files = list(default_files)
+            files = [path for path in files
+                     if os.path.exists(path)]
 
         else:
             files = []

tests/test_conf.py

@@ -437,6 +437,12 @@ winsvc.RattailFileMonitor = /path/to/other/file
         files = conf.get_config_paths(files=[myconf], winsvc='RattailFileMonitor')
         self.assertEqual(files, ['/path/to/other/file'])
 
+    def test_nonexistent_default_files(self):
+        files = conf.get_config_paths(files=None,
+                                      env_files_name='IGNORE_THIS',
+                                      default_files=['/this/does/not/exist'])
+        self.assertEqual(files, [])
+
 
 class TestMakeConfig(FileConfigTestCase):