fix pyuic wrapper where qt4 & 5 are available

Author: jef-n

python/core/__init__.py

@@ -1,3 +1,9 @@
+try:
+    import sip
+    sip.setapi("QVariant", 2)
+except:
+    pass
+
 import inspect
 import string
 from qgis._core import *