Describes the cause and action for error messages.
Error Message(English)：
if function excel is not blank
Excel NOT Function
https://exceljet.net/excel-functions/excel-not-function
Excel ISBLANK Function
https://exceljet.net/excel-functions/excel-isblank-function
Excel formula: If cell is blank | Exceljet
https://exceljet.net/formula/if-cell-is-blank
Excel formula: If cell is not blank - Excelcht - Got-it.ai
https://www.got-it.ai/solutions/excel-chat/excel-tutorial/if/if-cell-is-not-blank
How to Determine IF a Cell is Blank or Not Blank in Excel - Got-it.ai
https://www.got-it.ai/solutions/excel-chat/excel-tutorial/if/blank-not-blank
Using IF to check if a cell is blank - Office Support
https://support.office.com/en-us/article/using-if-to-check-if-a-cell-is-blank-dff4eda1-6187-4b83-b7f・・・
excel - if cell is not blank, then do IF statement - Stack Overflow
https://stackoverflow.com/questions/28879238/excel-if-cell-is-not-blank-then-do-if-statement
If Cell is Blank - Easy Excel Tutorial
https://www.excel-easy.com/examples/if-cell-is-blank.html
Excel ISBLANK Function - How to Use ISBLANK with Examples
https://corporatefinanceinstitute.com/resources/excel/functions/excel-isblank/