Description:
After a fresh Archlinux install, when pango is installed for the first time, pango applications fail to display fonts properly, and complain in the console.
For example, with xfce4-about :

----- LOG START -----
(xfce4-about:9028): Pango-CRITICAL **: No modules found:
No builtin or dynamically loaded modules were found.
PangoFc will not work correctly.
This probably means there was an error in the creation of:
'/etc/pango/pango.modules'
You should create this file by running:
pango-querymodules > '/etc/pango/pango.modules'

(xfce4-about:9028): Pango-WARNING **: failed to find shape engine, expect ugly output. engine-type='PangoRenderFc', script='latin'

(xfce4-about:9028): Pango-WARNING **: failed to find shape engine, expect ugly output. engine-type='PangoRenderFc', script='common'
----- LOG END -----

The file /etc/pango/pango.modules actually exists, but is empty.
After running "pango-querymodules > '/etc/pango/pango.modules'" as advised, everything works fine.
While this command is present in pango install scriptlet, it does not seem to work properly when pango is installed for the first time.
I could not figure out why, as pango's dependencies were correctly installed before pango itself.

Additional info:
* pango 1.22.4-1
* xfce-utils 4.6.0-1 (only used to "test" the bug)

Steps to reproduce:
Despite my efforts to reproduce this bug, I did not succeed.
I simply could not afford to reinstall the box completely just to find out what went wrong...