fix missing error message for bad logins
diff --git a/planetstack/templates/admin/login.html b/planetstack/templates/admin/login.html
index a165707..293834c 100644
--- a/planetstack/templates/admin/login.html
+++ b/planetstack/templates/admin/login.html
@@ -25,7 +25,12 @@
 {% endif %}
 
 {% if form.non_field_errors or form.this_is_the_login_form.errors %}
-{% for error in form.non_field_errors|add:form.this_is_the_login_form.errors %}
+{% for error in form.non_field_errors %}
+<p class="errornote">
+    {{ error }}
+</p>
+{% endfor %}
+{% for error in form.this_is_the_login_form.errors %}
 <p class="errornote">
     {{ error }}
 </p>