Fix for #935

cps/web.py

@@ -3246,10 +3246,16 @@ def edit_user(user_id):
     if request.method == "POST":
         to_save = request.form.to_dict()
         if "delete" in to_save:
+            if ub.session.query(ub.User).filter(and_(ub.User.role.op('&')
+                                                             (ub.ROLE_ADMIN)== ub.ROLE_ADMIN,
+                                                         ub.User.id != content.id)).count():
                 ub.session.query(ub.User).filter(ub.User.id == content.id).delete()
                 ub.session.commit()
                 flash(_(u"User '%(nick)s' deleted", nick=content.nickname), category="success")
                 return redirect(url_for('admin'))
+            else:
+                flash(_(u"No admin user remaining, can't delete user", nick=content.nickname), category="error")
+                return redirect(url_for('admin'))
         else:
             if "password" in to_save and to_save["password"]:
                 content.password = generate_password_hash(to_save["password"])