Description of problem:
If installing or updating gnome-icon-theme with a theme with a space in the
directory name already installed, an errors such as:
 No theme index file in '/usr/share/icons/Crystal'.
 If you really want to create an icon cache here, use --ignore-theme-index.
is reported.

Version-Release number of selected component (if applicable):
2.14.2-1.fc5.1

How reproducible:
Every time.

Steps to Reproduce:
1. Install a theme such as Crystal Clear (http://linuxcult.com/node/10) for KDE.
2. rpm -e gnome-icon-theme --nodeps
3. yum -y install gnome-icon-theme
  
Actual results:
.
:
Running Transaction
  Installing: gnome-icon-theme             ######################### [1/1]
No theme index file in '/usr/share/icons/Crystal'.
If you really want to create an icon cache here, use --ignore-theme-index.

Installed: gnome-icon-theme.noarch 0:2.14.2-1.fc5.1
Complete!


Expected results:
.
:
Running Transaction
  Installing: gnome-icon-theme             ######################### [1/1]

Installed: gnome-icon-theme.noarch 0:2.14.2-1.fc5.1
Complete!

Additional info:
The %post script reads:
postinstall scriptlet (using /bin/sh):
for dir in /usr/share/icons/*; do
  if test -d "$dir"; then
    if test -f "$dir/index.theme"; then
      /usr/bin/gtk-update-icon-cache --quiet $dir
    fi
  fi
done

The gtk-update-icon-cache line should read:
      /usr/bin/gtk-update-icon-cache --quiet "$dir"

The other lines are already quoted so do not suffer this problem.