Allow pyrasite to be installed without pygobject. Complain when running the gui.

pyrasite/tools/gui.py

@@ -35,8 +35,13 @@ from random import randrange
 try:
     from meliae import loader
 except:
-    pass
-from gi.repository import GLib, GObject, Pango, Gtk, WebKit
+    print "Unable to import meliae. Object memory analysis disabled."
+try:
+    from gi.repository import GLib, GObject, Pango, Gtk, WebKit
+except ImportError:
+    print "Unable to find pygobject3. Please install the 'pygobject3' "
+    print "package on Fedora, or 'python-gobject-dev on Ubuntu."
+    sys.exit(1)
 
 import pyrasite
 from pyrasite.utils import setup_logger, run, humanize_bytes

setup.py

@@ -12,12 +12,6 @@ except ImportError:
     print "We require meliae to be installed."
     exit(1)
 
-try:
-    from gi.repository import  GLib, GObject, Pango, Gtk, WebKit
-except ImportError:
-    print "We require python-gobject-dev installed.  Use: apt-get install python-gobject-dev"
-    exit(1)
-
 setup(name='pyrasite',
       version=version,
       description="Inject code into a running Python process",