Delete Next Blank Line IFF Current Line is Less than 80 Characters

Hello,Seders,
How can I delete the next blank line if the current line is less than 80 
characters from within a bash script?
Example:

"This line is a Heading

This line starts as a paragraph with one or more than one sentences and 
the paragraph is more than 80 characters."

Like to delete the blank line between the two lines above.
Thanks,Kwon