When you say 'blank lines', do you mean totally empty lines in the source-code, or lines like this:
<p> </p>
Either way, if you have all the pages organised into a DW Site, you could use the Find/Replace tool sitewide. The tool can use regular expressions
To get rid of blank lines (or lines containing only spaces) in source, replace
<Shift+Enter>
\s*<Shift+Enter>
with
<Shift+Enter>
To get rid of lines with only <p> </p> (<p> tag may have attributes), replace
<Shift+Enter>
\s*<[pP][\s\S]*> </[pP]>\s*<Shift+Enter>
with
<Shift+Enter>
I'd suggest running this on a test page first, to make sure you get the results you expect.
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