Ensure people cannot create instances without first configuring the module.

tripal_jbrowse_mgmt/includes/tripal_jbrowse_mgmt_add.form.inc

@@ -3,13 +3,15 @@
 function tripal_jbrowse_mgmt_add_form($form, &$form_state) {
   $settings = tripal_jbrowse_mgmt_get_settings();
 
-  if (empty(array_values($settings))) {
+  // Ensure the module is configured.
+  if (empty(array_filter($settings))) {
     $form['incomplete'] = [
       '#type' => 'item',
-      '#prefix' => '<div style="color: red;">',
+      '#prefix' => '<div class="messages error">',
       '#markup' => t(
-        'You have not configured the module yet. Please visit the 
-                      settings page and submit the form before continuing.'
+        'You have not configured the module yet. Please visit the
+            <a href="@url">settings page</a> and submit the form before continuing.',
+        ['@url' => url('admin/tripal/extension/tripal_jbrowse/management/configure')]
       ),
       '#suffix' => '</div>',
     ];
@@ -28,7 +30,7 @@ function tripal_jbrowse_mgmt_add_form($form, &$form_state) {
   $form['description_of_form'] = [
     '#type' => 'item',
     '#markup' => t(
-      'Create a new JBrowse instance for a given organism. Submitting this form 
+      'Create a new JBrowse instance for a given organism. Submitting this form
       creates all the necessary files for a new JBrowse instance.'
     ),
   ];

tripal_jbrowse_mgmt/includes/tripal_jbrowse_mgmt_list.page.inc

@@ -8,6 +8,14 @@ function tripal_jbrowse_mgmt_instances_page() {
   $instances = tripal_jbrowse_mgmt_get_instances();
   $settings = tripal_jbrowse_mgmt_get_settings();
 
+  // Ensure people set settings before adding an instance!
+  if (empty($settings['data_dir'])) {
+    drupal_set_message(t(
+      'The <a href="@url">Location of your JBrowse</a> is required before creating an instance.',
+        ['@url' => url('admin/tripal/extension/tripal_jbrowse/management/configure')]),
+      'error');
+  }
+
   $content = [];
 
   if (empty($instances)) {