Add another useful python interpreter statement for playing with data

README.md

@@ -78,3 +78,9 @@ tl.groupby("project").agg({"time": "sum"})["time"]/60
 ```
 
 And yeah you can just sort of tack on the column you want to mess with and do an operation like that!
+
+##### List tasks that had no properly defined project
+
+```python
+tl[tl.project == ""]
+```