How to Omit NaN values when applying groupyby in Pandas
I get that the mean of that particular group is NAN when a NAN value
  is present

FALSE! :)
the mean will only consider non null values. You are safe my man.
I have a dataset consisting of multiple columns and I want to calculate the average by using the groupby function in Python. However, since some of the values are NAN I get that the mean of that particular group is NAN when a NAN value is present. I would like to omit this value, not set it to zero or fill it with any statistical variable, just omit.
Any idea how I can achieve this?
Thanks in advance!