Make ConditionalFieldsFormHelper class instantiable

#2: Thanks for offering to work on this!

I don't see any patch here so this should still be Active. Fixing status.

Anyone if free to take this over as there's been no update in a while.

+++ b/src/ConditionalFieldsFormHelper.php
@@ -21,139 +29,143 @@ class ConditionalFieldsFormHelper {
+      $dependees = $dependent_info['dependees'];
+      if (empty($dependees)) {
         continue;
       }

The first line here is producing this on node edit pages with conditional fields (probably where there are no dependees):

Notice: Undefined index: dependees in Drupal\conditional_fields\ConditionalFieldsFormHelper->processDependentFields() (line 57 of modules/contrib/conditional_fields/src/ConditionalFieldsFormHelper.php).

+++ b/src/ConditionalFieldsFormHelper.php
@@ -21,139 +29,143 @@ class ConditionalFieldsFormHelper {
+    $this->processDependentFields();
+    $this->addJavascriptEffects();
+    $this->addValidationCallback();
+
+    return $this->form;

I personally like method chaining, but I'm happy either way so feel free to skip it. So if all of these methods return $this, we can do:

return $this->processDependentFields()->addJavascriptEffects()->addValidationCallback()->form;

Overall, seems to work well in my tests except for the undefined-index error above.

Much better.