FindQsci: removed the unused exception holder variable

master didn't build without that:
-- Found PyQt4 version: 4.10
  File "~/carina/Quantum-GIS/cmake/FindQsci.py", line 41
    except ImportError, e:
                      ^
SyntaxError: invalid syntax

cmake/FindQsci.py

@@ -38,7 +38,7 @@
 try:
     from PyQt4.Qsci import QSCINTILLA_VERSION_STR
     VER = QSCINTILLA_VERSION_STR
-except ImportError, e:
+except ImportError:
     VER = ""