Fixed pyside import error

Qt.py

@@ -1,9 +1,12 @@
 ## Do all Qt imports from here to allow easier PyQt / PySide compatibility
 
 USE_PYSIDE = False   ## If False, import PyQt4. If True, import PySide
+                     ## Note that when switching between PyQt and PySide, all template
+                     ## files (*.ui) must be rebuilt for the target library.
 
 if USE_PYSIDE:
     from PySide import QtGui, QtCore, QtOpenGL, QtSvg
+    import PySide
     VERSION_INFO = 'PySide ' + PySide.__version__
 else:
     from PyQt4 import QtGui, QtCore