Fix bug 546 - "Python crash on exit"

Reviewer: Marcelo Lira <marcelo.lira@openbossa.org>
          Lauro Moura <lauro.neto@openbossa.org>

tests/QtGui/bug_546.py

@@ -0,0 +1,14 @@
+import unittest
+from PySide.QtGui import *
+
+class TestBug546(unittest.TestCase):
+
+    """Test to check a crash at exit"""
+    def testIt(self):
+        app = QApplication([])
+        textEdit = QPlainTextEdit()
+        completer = QCompleter(("foo", "bar"), textEdit)
+        completer.setWidget(textEdit)
+
+if __name__=='__main__':
+    unittest.main()