s-c-p.py: Move requiring Handy version into try: scope (fixes #283)

libhandy is optional, so we don't have to end with traceback.

Author: zdohnal

NEWS

@@ -3,6 +3,7 @@
 - Add <launchable/> into the .appdata.xml file (#269)
 - Accessiblity improvements (#244)
 - system-config-printer couldn't be uninstalled vi GNOME Software (#273)
+- system-config-printer crashes due missing libhandy (#283)
 - Use pkg-config or --with-cups-serverbin-dir for finding SERVERBIN (#234)
 
 1.5.17 changes

system-config-printer.py

@@ -47,9 +47,9 @@
     print ("This is a graphical application and requires DISPLAY to be set.")
     sys.exit (1)
 
-# Optional dependency, requires libhandy >= 1.5
-gi.require_version('Handy', '1')
 try:
+    # Optional dependency, requires libhandy >= 1.5
+    gi.require_version('Handy', '1')
     from gi.repository import Handy
     Handy.init()
     # Support GNOME 42 dark mode