[n/a] code review comment and extra regression test

Author: AnomalRoil

internal/config/config.go

@@ -300,7 +300,7 @@ func (c *Config) migrateOptions(migrations map[string]string) {
 			}
 		}
 	}
-	if err := errors.Join(errors.Join(errs...)); err != nil {
+	if err := errors.Join(errs...); err != nil {
 		debug.Log("Errors encountered while migrating old options: {%v}", err)
 	}
 }

pkg/gitconfig/configs_test.go

@@ -96,4 +96,5 @@ func TestConfigs(t *testing.T) {
 	require.Error(t, c.SetLocal("core.foo", "bar"))
 	require.NoError(t, c.SetGlobal("core.global", "foo"))
 	require.NoError(t, c.SetEnv("env.var", "var"))
+	require.False(t, c.IsSet("env.nonexistent"))
 }