Without opening your Zip file...sounds like you are stating the following.
Check if Cell 1 is empty, 1TRUE= Check if Cell 2 is BLANK or Empty,
2TRUE= If it is also than result is BLANK
2FALSE= If Cell 2 is NOT BLANK where Cell 1 is BLANK then process formula based on cell 2
1FALSE=if 1 is NOT BLANK, check again to see if Cell 2 is BLANK
3TRUE=if CELL 2 is than your formula based on Cell 1 not BLANK and While cell 2 is BLANK
3False=Otherwise neither are blank so process formula based on both NOT BLANK
=IF(OR(CELL 1="",CELL 1=0),IF(OR(CELL 2="",CELL 2=0),"", YOUR FORMULA WITH CELL 2 not blank),IF(OR(CELL 2="",CELL 2=0),FORMULA When CELL 1 IS NOT BLANK but CELL 2 IS),Formula when Neither cell is blank)
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