If item equals Null

[KenH]

Looking to add the option to use flow to check if an item in a SharePoint list is existing or not, i.e. If item = NULL.

[rjj88]

+1

Trying to set a condition that is true if RETURN DATE is blank so that if the return date field is blank, a reminder email is sent

Am I correct in thinking this will work?

Condition:

RETURN DATE is equal to ""

Is "" the correct syntax for blank/empty string?

[SMBISYS]

I had exact same issue.  I was able to work around using the coalesce function listed in Azure's Logic Apps documentation.  

https://docs.microsoft.com/en-us/azure/logic-apps/logic-apps-workflow-definition-language

Instead of checking for null, I checked if the date was greater than a date far in the past.  I wrapped the basic condition generated automatically by flow inside the coalesce function (you have to switch to advanced mode).  The coalesce function will not return a null.  If your date field is null it returns a "fallback" value that you set in the function.  Just set the fallback date less than the date in your condition.   In the example below I check to see if my ReceiveDate field is greater than 1/1/1991.  If yes then I send an email:

Basic condition: 

@greater(triggerBody()?['ReceiveDate'], '01/01/1991')

Advanced condition with coalesce function:

@greater(coalesce(triggerBody()?['ReceiveDate'],'01/01/1990'), '01/01/1991')