[Fix] Collection of minor Bugfixes (#417)

User feedback from on-prem installation

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#417

templates/collections/models_paginated.html

@@ -3,14 +3,16 @@
 {% block page_title %}Models{% endblock %}
 
 {% block action_button %}
-  {% if meta.can_edit and meta.enabled_features.MODEL_BUILDING %}
-    <button
-      type="button"
-      class="btn btn-primary btn-sm"
-      onclick="document.getElementById('new_model_modal').showModal(); return false;"
-    >
-      New Model
-    </button>
+  {% if meta.can_edit or not meta.url_contains_package %}
+    {% if meta.enabled_features.MODEL_BUILDING %}
+      <button
+        type="button"
+        class="btn btn-primary btn-sm"
+        onclick="document.getElementById('new_model_modal').showModal(); return false;"
+      >
+        New Model
+      </button>
+    {% endif %}
   {% endif %}
 {% endblock action_button %}