fix 500 when delete orgnization and resolved #486 (#507)

models/org.go

@@ -206,12 +206,9 @@ func Organizations(page, pageSize int) ([]*User, error) {
 
 // DeleteOrganization completely and permanently deletes everything of organization.
 func DeleteOrganization(org *User) (err error) {
-	if err := DeleteUser(org); err != nil {
-		return err
-	}
-
 	sess := x.NewSession()
-	defer sessionRelease(sess)
+	defer sess.Close()
+
 	if err = sess.Begin(); err != nil {
 		return err
 	}
@@ -228,7 +225,11 @@ func DeleteOrganization(org *User) (err error) {
 		return fmt.Errorf("deleteUser: %v", err)
 	}
 
-	return sess.Commit()
+	if err = sess.Commit(); err != nil {
+		return err
+	}
+
+	return RewriteAllPublicKeys()
 }
 
 // ________                ____ ___

models/user.go

@@ -885,8 +885,10 @@ func deleteUser(e *xorm.Session, u *User) error {
 	}
 
 	avatarPath := u.CustomAvatarPath()
-	if err := os.Remove(avatarPath); err != nil {
-		return fmt.Errorf("Fail to remove %s: %v", avatarPath, err)
+	if com.IsExist(avatarPath) {
+		if err := os.Remove(avatarPath); err != nil {
+			return fmt.Errorf("Fail to remove %s: %v", avatarPath, err)
+		}
 	}
 
 	return nil