Conditionnal formating based on empty (or not) fields

Chonski55 

If Status is single selection choice column, Owner is single selection person or group column and "Date is a Date & Time column, you can use JSON view formatting like below in "Advanced mode": 

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/view-formatting.schema.json",
  "additionalRowClass": "=if([$Status]=='' && Number([$DueDate])==0 && [$Owner.title]=='', 'ms-bgColor-red', if([$Status]!='' && Number([$DueDate])==0 && [$Owner.title]!='','ms-bgColor-orangeLighter',if([$Status]!='' && Number([$DueDate])!=0 && [$Owner.title]!='','ms-bgColor-gray100','')))"
}

Output: 

Where Status, Owner and DueDate are internal names of your SharePoint list columns. You can get the internal name of your SharePoint list columns by following this article: How to find the Internal name of columns in SharePoint Online? 

Here, I have used Number([$DueDate]) == 0 to check if Date & Time column in SharePoint list is empty or not. You can find other ways to check if date & time column is empty or not using SharePoint JSON formatting at: SharePoint JSON formatting: Check if date & time column is blank/empty 

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