fixed careless import of Tkinter

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@306 bbaffbd6-741e-11dd-a85d-61de82d9cad9

Changelog

 Version 0.2.4 - UNRELEASED
  * join tangential moves (removes the inner points in a colinear set of adjacent path points)
+ * fixed careless import of Tkinter
 
 Version 0.2.3 - 2010-04-05
  * GUI change: tool and process settings can be combined into tasks

pycam/Gui/common.py

-import Tkinter
+# Tkinter is used for "EmergencyDialog" below - but we will try to import it carefully
+#import Tkinter
 # "ode" is imported later, if required
 #import ode_objects
 import random
@@ -126,6 +127,13 @@ class EmergencyDialog:
     """
 
     def __init__(self, title, message):
+        try:
+            import Tkinter
+        except ImportError:
+            # tk is not installed
+            print >>sys.stderr, "Warning: %s" % str(title)
+            print >>sys.stderr, message
+            return
         try:
             root = Tkinter.Tk()
         except Tkinter.TclError, err_msg: