validation_table.html: Special message if root object not array

cove_bods/templates/cove_bods/validation_table.html

@@ -38,7 +38,11 @@
       {% elif errors.0.validator == "type" and errors.0.validator_value == "number" %}
         <strong><code>{{ errors.0.path_ending }}</code> should be a number. Check that the value is not null, and doesn’t contain any characters other than 0-9 and dot (<code>.</code>). Number values should not be in quotes.</strong>
       {% elif errors.0.validator == "type" and errors.0.validator_value == "array" %}
-        <strong><code>{{ errors.0.path_ending }}</code> should be a JSON array. Check that value(s) appear within square brackets, [...]</strong>
+        {% if errors.0.path_ending == "" %}
+            <strong>The dataset should be a JSON array. Check that the object(s) appear within square brackets, [...]</strong>
+        {% else %}
+            <strong><code>{{ errors.0.path_ending }}</code> should be a JSON array. Check that value(s) appear within square brackets, [...]</strong>
+        {% endif %}
       {% elif errors.0.validator == "type" and errors.0.validator_value == "string" %}
         <strong><code>{{ errors.0.path_ending }}</code> should be a string. Check that the value is not null, and has quotes at the start and end. Escape any quotes in the value with <code>\</code></strong>
       {% elif errors.0.validator == "type" and errors.0.validator_value == "boolean" %}