Text.Combine return null for empty table

[ZachRoberts]

Hello,

I have a column of tables like below:

I can expand the column to extract the values but that adds a duplicate line for each value - so I am using the below line in my power query to add a column that combines the text from a value in the tables.

Table.AddColumn(#Source, "Project/System", each Text.Combine(Table.Column[ProjectSystem], "Title"), ", "))

This works as expected and I am presented with a new column that combines the values as I like but I do have a few records where this throws an error because the table is empty. 

How can I have the above line return null to the new column if the table value is empty?

Thanks,

Zach 

[ChrisMendoza · Accepted solution]

@ZachRoberts - have you taken a look at https://docs.microsoft.com/en-us/power-query/handlingerrors ? e.g. try otherwise

[ZachRoberts]

Thanks! That was the ticket 🙂 

changed my query to the below and it worked

Table.AddColumn(#Source, "Project/System", each  try Text.Combine(Table.Column([ProjectSystem], "Title"),", ") otherwise null)