do not set model to nil on raw csv data (#376)

* do not set model to nil on raw csv data

* spec fix

app/models/bulkrax/csv_entry.rb

@@ -24,7 +24,7 @@ def self.data_for_entry(data, _source_id)
       data = data.first if data.is_a?(CSV::Table)
       # model has to be separated so that it doesn't get mistranslated by to_h
       raw_data = data.to_h
-      raw_data[:model] = data[:model]
+      raw_data[:model] = data[:model] if data[:model].present?
       # If the collection field mapping is not 'collection', add 'collection' - the parser needs it
       raw_data[:collection] = raw_data[collection_field.to_sym] if raw_data.keys.include?(collection_field.to_sym) && collection_field != 'collection'
       # If the children field mapping is not 'children', add 'children' - the parser needs it

spec/models/bulkrax/importer_spec.rb

@@ -78,7 +78,6 @@ module Bulkrax
         it 'creates a default mapping from the column headers' do
           expect(importer.mapping).to eq(
             "collection" => { "excluded" => false, "from" => ["collection"], "if" => nil, "parsed" => false, "split" => false },
-            "model" => { "excluded" => false, "from" => ["model"], "if" => nil, "parsed" => true, "split" => false },
             "source_identifier" => { "excluded" => false, "from" => ["source_identifier"], "if" => nil, "parsed" => false, "split" => false },
             "title" => { "excluded" => false, "from" => ["title"], "if" => nil, "parsed" => false, "split" => false }
           )