Description of problem:
Any attempt to start or restart service kdump gets
/etc/init.d/kdump: line 134: [: too many arguments

Version-Release number of selected component (if applicable):
kdump-kexec from RHEL5.3-snap2

How reproducible:
Always

Steps to Reproduce:
1. touch /etc/kdump.conf
2. service kdump restart
  
Actual results:
/etc/init.d/kdump: line 134: [: too many arguments

Expected results:
Should work.

Additional info:
The line being complained about in /etc/init.d/kdump (line 134) is:

if [ -n "$FORCE_REBUILD" -a $modified_files!=" "]

It should be:
if [ -n "$FORCE_REBUILD" -a "$modified_files"!=" "]

which works fine.