Forcing default_value to an array, if the dynamic dropdown is multise…

…lect

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1559030

app/models/dialog_field_radio_button.rb

@@ -7,6 +7,10 @@ def initial_values
     [[nil, "<None>"]]
   end
 
+  def force_multi_value
+    false
+  end
+
   private
 
   def raw_values

app/models/dialog_field_sorted_item.rb

@@ -96,6 +96,9 @@ def sort_data(data_to_sort)
   end
 
   def determine_selected_default_value
+    if dynamic? && force_multi_value && !default_value.kind_of?(Array)
+      self.default_value = Array.wrap(default_value)
+    end
     use_first_value_as_default unless default_value_included?(@raw_values)
     self.value ||= default_value.nil? && data_type == "integer" ? nil : default_value.send(value_modifier)
   end