Crash on close()

[sdegrande]

Given that the close() method calls __clock.cancel(), if crashes if a clock was not initialized.

This simple patch is working for me :

diff --git a/lib/StupidArtnet.py b/lib/StupidArtnet.py
index 10b92d8..c26ae22 100644
--- a/lib/StupidArtnet.py
+++ b/lib/StupidArtnet.py
@@ -133,7 +133,10 @@ class StupidArtnet():
 
        def stop(self):
                """Stops thread clock."""
-               self.__clock.cancel()
+               try:
+                       self.__clock.cancel()
+               except:
+                       pass
 
        ##
        # SETTERS - HEADER

[cpvalente]

thank you
fixed as suggested #5