how to fix a unix shell script to work on linux

[Josef Lowder]

.
The following script used to work on my old unix system, 
to remove blank lines from a text file.  It no longer works 
on linux, but now it gives an error message (below): 

sed '/[!-~]/!d' $1


This is the error message:

sed: -e expression #1, char 7: Invalid range end

How can I fix this?