Find and set null values to 0 in curancy field.

Find and set null values to 0 in curancy field.

I have a currency field in which I did not set an initial value so it shows up as blank in my view.  I now would like to find all null or blank values in my view/report and set them to 0.00 with out impacting the existing values.  

Please would be very much appreciated. 
Thank you very much