Help me! grep the log file without blank lines in column

Shell Programming and Scripting
1

Hi,

I have log file like this:

i want grep the log file without blank lines in column 4. So the file is become like this :

What is the command?
please help me.

2 
$ awk -F";" '$4' infile
11;aaaa;3G;0001;AAAA;11AA
33;cccc;3G;0003;CCCC;33CC
55;eeee;2G;0005;;55EE