Add automate engine support for array elements containing text values.

PR: ManageIQ#11667

lib/miq_automation_engine/engine/miq_ae_object.rb

@@ -279,11 +279,15 @@ def process_args_attribute(args, args_key)
     end
 
     def load_array_objects_from_string(objects_str)
-      objects_str.split(',').collect do |o|
-        klass, str_value = o.split(CLASS_SEPARATOR)
-        value = MiqAeObject.convert_value_based_on_datatype(str_value, klass)
-        value if value.kind_of?(MiqAeMethodService::MiqAeServiceModelBase)
-      end.compact
+      objects_str.split(',').collect do |element|
+        if element.include?(CLASS_SEPARATOR)
+          klass, str_value = element.split(CLASS_SEPARATOR)
+          MiqAeObject.convert_value_based_on_datatype(str_value.strip, klass.strip)
+        else
+          element.presence
+        end.compact
+      end
+
     end
 
     def get_key_name_and_klass_from_key(attribute_key)
@@ -531,6 +535,8 @@ def self.convert_value_based_on_datatype(value, datatype)
         return service_model.find(value)
       end
 
+      (raise MiqAeException::InvalidClass unless MiqAeField.available_datatypes.include?(datatype)) if datatype
+
       # default datatype => 'string'
       value
     end