Space between equations/figure depends on previous paragraph/newline

I need to rewrite a Latex book and optimze the code and found a "problem" which I cant solve and dont find a global solution.

In my opinion the code is better to read, if there is a newline/paragraph between text and equation-block.
But this leads to an bigger cap between text and equation, which I try to avoid.

My question is, is it possible to insert a new line in code (for easier code reading) without increasing the gap between text and equation?

Here is my minimal code example:

documentclass{book}
begin{document}
chapter{Gap}
section{testcase 1}
This is a test sentence and has nothing to do with the real problem.
    begin{equation}
        a=b+x
    end{equation}
This is a test sentence and has nothing to do with the real problem.


section{testcase 2}
This is a test sentence and has nothing to do with the real problem.

    begin{equation}
        a=b+x
    end{equation}

This is a test sentense and has nothing to do with the real problem.

end{document}

Here a picture how it looks like:

I know its not a big difference but still.