PERF: Speedup loading of modules including Editor effects

Loading time improved by ~45% (2.6s -> 1.4s, warm cache)
for the following modules:

* Editor
* ThresholdThreadingTest
* SlicerMRBMultipleSaveRestoreTest
* SlicerMRBMultipleSaveRestoreLoopTest
* NeurosurgicalPlanningTutorialMarkupsSelfTest

git-svn-id: http://svn.slicer.org/Slicer4/trunk@25134 3bd1e089-480b-0410-8dfb-8563597acbee

Author: jcfr

Modules/Scripted/EditorLib/WatershedFromMarkerEffect.py

@@ -7,13 +7,6 @@
 
 import math
 
-HAVE_SIMPLEITK=True
-try:
-  import SimpleITK as sitk
-  import sitkUtils
-except ImportError:
-  HAVE_SIMPLEITK=False
-
 __all__ = [
   'WatershedFromMarkerEffectOptions',
   'WatershedFromMarkerEffectTool',
@@ -46,7 +39,10 @@ def __del__(self):
   def create(self):
     super(WatershedFromMarkerEffectOptions,self).create()
 
-    if not HAVE_SIMPLEITK:
+    try:
+      import SimpleITK as sitk
+      import sitkUtils
+    except ImportError:
       self.warningLabel = qt.QLabel()
       self.warningLabel.text = "WatershedFromMarker is not available because\nSimpleITK is not available in this build"
       self.widgets.append(self.warningLabel)
@@ -207,7 +203,6 @@ def processEvent(self, caller=None, event=None):
     """
     pass
 
-
 #
 # WatershedFromMarkerEffectLogic
 #
@@ -231,13 +226,10 @@ def __init__(self,sliceLogic):
   def apply(self,xy):
     pass
 
-  try:
+  def doit(self):
+
     import SimpleITK as sitk
     import sitkUtils
-  except ImportError:
-    pass
-
-  def doit(self):
 
     labelLogic = self.sliceLogic.GetLabelLayer()
     labelNode = labelLogic.GetVolumeNode()