Issue #3380371 Corrected exception class

It turns out that the attribute might be missing from some objects of
the same class while being present in others.

src/Acumatica/Model/AttributeHelper.php

@@ -21,9 +21,6 @@ class AttributeHelper {
    * @throws \RuntimeException
    *   When the object does not have any attributes, does not have the requested
    *   attribute, or does not have the value field defined.
-   * @throws \InvalidArgumentException
-   *   When the object does not have any attributes, or does not have the
-   *   requested attribute.
    */
   public static function getValue(string $attribute_id, \stdClass $object) {
     if (!isset($object->Attributes)) {
@@ -63,13 +60,7 @@ class AttributeHelper {
       return $attribute->Value->value ?? NULL;
     }
 
-    // When an attribute is defined on the object's class in Acumatica, the
-    // objects fetched by API calls contain the attribute object even if it is
-    // not set on the object. It's just that the value is `NULL` - see above for
-    // more details on the exact behavior. Thus, if the attribute for the
-    // requested ID was not found, it must be an error i.e. requesting an
-    // attribute that does not exist on the object's class.
-    throw new \InvalidArgumentException(sprintf(
+    throw new \RuntimeException(sprintf(
       'The requested attribute "%s" is not defined on the given object\'s class.',
       $attribute_id
     ));