Can’t Import Data into Magento 2.1 – Troubleshooting Guide

I've got two test products to import. One is exported from Magento and can be imported without issues.
The other one appears to be almost identical but has been manually created.

I can't figure out what's the problem there.

"sku","store_view_code","attribute_set_code","product_type","categories","product_websites","name","description","short_description","weight","product_online","tax_class_name","visibility","price","special_price","special_price_from_date","special_price_to_date","url_key","meta_title","meta_keywords","meta_description","base_image","base_image_label","small_image","small_image_label","thumbnail_image","thumbnail_image_label","swatch_image","swatch_image_label","created_at","updated_at","new_from_date","new_to_date","display_product_options_in","map_price","msrp_price","map_enabled","gift_message_available","custom_design","custom_design_from","custom_design_to","custom_layout_update","page_layout","product_options_container","msrp_display_actual_price_type","country_of_manufacture","additional_attributes","qty","out_of_stock_qty","use_config_min_qty","is_qty_decimal","allow_backorders","use_config_backorders","min_cart_qty","use_config_min_sale_qty","max_cart_qty","use_config_max_sale_qty","is_in_stock","notify_on_stock_below","use_config_notify_stock_qty","manage_stock","use_config_manage_stock","use_config_qty_increments","qty_increments","use_config_enable_qty_inc","enable_qty_increments","is_decimal_divided","website_id","related_skus","related_position","crosssell_skus","crosssell_position","upsell_skus","upsell_position","additional_images","additional_image_labels","hide_from_product_page","custom_options","bundle_price_type","bundle_sku_type","bundle_price_view","bundle_weight_type","bundle_values","bundle_shipment_type","associated_skus"
"Test4No",,"Default","simple",,"base","Test4NoImport",,,,1,"Taxable Goods","Catalog, Search","695.0000",,,,"test4-no-import","Test4NoImport","Test4NoImport","Test4NoImport",,,,,,,,,,,,,"Block after Info Column",,,,"Use config",,,,,,,," ","sw_featured=No",,"0.0000",1,0,0,1,"1.0000",1,"10000.0000",1,1,"1.0000",1,0,1,1,"1.0000",1,0,0,0,,,,,,,,,,,,,,,,,
"Test4",,"Default","simple",,"base","Test4Import",,,,1,"Taxable Goods","Catalog, Search","19.0000",,,,"test4","Test4","Test4","Test4",,,,,,,,,,,,,"Block after Info Column",,,,"Use config",,,,,,,,,"sw_featured=No",,"0.0000",1,0,0,1,"1.0000",1,"10000.0000",1,1,"1.0000",1,0,1,1,"1.0000",1,0,0,0,,,,,,,,,,,,,,,,,

That csv won't import, wihtout line 2 it's working nice.

The error is always:

General system exception happened
Additional data: Notice: Undefined index: in /var/www/html/app/code/Magento/CatalogImportExport/Model/Import/Product/Type/AbstractType.php on line 496

Saved via LibreOffice, tried UTF8-BOM, UTF8.
I hope someone is able to spot the issue!?
Thanks in advance.