Most of the time a block of code is empty when a piece of code is really missing. So such empty block must be either filled or removed.
Noncompliant Code Example
C 99W1SCNO IFEQ 1
C EXSR SR201
C* Empty on purpose or missing a piece of code?
for i = 1 to n;
When a block contains a comment, this block is not considered to be empty.