Describes the cause and action for error messages.
Error Message(English)：
if statement excel is not null
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 ISBLANK Function
https://exceljet.net/excel-functions/excel-isblank-function
Return blank if
https://exceljet.net/formula/return-blank-if
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
IF AND Formula with IS NOT NULL in Excel - Stack Overflow
https://stackoverflow.com/questions/40122771/if-and-formula-with-is-not-null-in-excel
IF statement: IF cell is blank, leave blank, if not display 1 ...
https://stackoverflow.com/questions/45382030/if-statement-if-cell-is-blank-leave-blank-if-not-displa・・・
How to use ISBLANK in nested if-statement?
https://stackoverflow.com/questions/25717985/how-to-use-isblank-in-nested-if-statement