Change empty strings to spaces

This prevents NULLS when reading it with auto settings

data/duckdb-poem.csv

@@ -3,26 +3,26 @@ id,text
 2,"Where information doth explode 💥💾"
 3,"A database emerged quite new 🆕🦆"
 4,"DuckDB, the feathered friend we knew 🤝🐤"
-5,""
+5," "
 6,"With speed and efficiency 💨💪"
 7,"DuckDB solves queries with agility 🏃‍♂️🔍"
 8,"A feather-light database to deploy 🕊️💻"
 9,"For analytics to enjoy 📈🤩"
-10,""
+10," "
 11,"Structured, unstructured, and beyond 📊📉"
 12,"DuckDB stores it all in a bond 🔗"
 13,"SQL-compliant, it plays well 👍"
 14,"With other databases, we can tell 🤝💻"
-15,""
+15," "
 16,"A mallard in the world of tech 🦆💻"
 17,"DuckDB swims without a peck 🏊‍♂️❌"
 18,"In lakes of data it does wade 🌊💾"
 19,"A quack above the rest is made 🗣️👑"
-20,""
+20," "
 21,"So if you seek a database true 🤔🔍"
 22,"With power, speed, and charm anew 💪💨🤩"
 23,"Look no further than the duck 🦆"
 24,"DuckDB, a name you'll love to pluck 🤗🐤"
-25,""
+25," "
 26,"✍️  Poem by ChatGPT (Mar 14 Version.) 💻🤖📚"
 27,"ℹ️  https://help.openai.com/en/articles/6825453-chatgpt-release-notes"