How to have a formula extending over a column but ignore cells resulting in invalid value

This is a common problem and am assuming many users would have faced this. However, after an exhaustive search over the Internet and in several forums like this, I was not able to find a solution possibly because I'm not able to describe the problem and precise language.

I am, therefore, posting the query here and I hope I'm able to provide clarity.

This is the issue:
let's say I have a simple formula that just divides the number in the cell in an adjacent column with another number in another adjust cell. In other words,for the cell A3, the formula will look like this A3=A2/A1. And for cell B3, B3=B2/B1.

If B1 is having a value of zero or there is no entry in the cell B1, B3 will result in invalid value.

Sometimes, due to better readability, I have to leave alternate rows empty.
So extending the previous example, it will mean something like this:
A3 = A2/A1 - A1 will have valid values and therefore A3 will have valid values.. Let's assume A1=10, A2 = 10 and therefore A1=1
the entire row B will have to be kept empty just for readability purposes.So B1 will not have any value and therefore B3 will print invalid value
C3=C2/C1 - C1 will have valid values and therefore C3 will have valid values. Let's assume C1=10, C2=30 and therefore, C3 will be equal to 3

And we continue like this down the column. The problem is that since alternate rows are empty, the third column in the empty rows will be putting display invalid values.

So is there a way that I can create a formula which will ignore any empty rows . And if that is not possible, maybe the formula can exist in every row but invalid values should not be printed

Right now, I go and manually delete every cell that is printing invalid values and obviously that is not possible to do in large spreadsheets.

I hope there is a solution to it.

Thank you for any inputs

Thank you for your prompt response. Your solution will work. I will have to learn how to hide a column but I think that is easy to figure out.

Thank you for understanding my long winded explanation :-)