Avoid failing if additional dynamic modules is defined with files that don't exist

test/test_settings.py

@@ -21,3 +21,14 @@ def test_base_auto_import_modules(auto_import_json, Script):
 def test_auto_import_modules_imports(auto_import_json, Script):
     main, = Script('from json import tool; tool.main').goto_definitions()
     assert isinstance(main._name, CompiledContextName)
+
+
+def test_additional_dynamic_modules(monkeypatch, Script):
+    # We could add further tests, but for now it's even more important that
+    # this doesn't fail.
+    monkeypatch.setattr(
+        settings,
+        'additional_dynamic_modules',
+        ['/foo/bar/jedi_not_existing_file.py']
+    )
+    assert not Script('def some_func(f):\n f.').completions()