[processing] fix Modeler Calculator (ref #14305)

alexbruy · alexbruy · commit 1ffccf05c966 · 2016-02-16T20:59:50.000+02:00
diff --git a/python/plugins/processing/modeler/CalculatorModelerAlgorithm.py b/python/plugins/processing/modeler/CalculatorModelerAlgorithm.py
@@ -54,7 +54,7 @@ def defineCharacteristics(self):
                                           self.tr('Formula', 'CalculatorModelerAlgorithm'), ''))
         for i in range(AVAILABLE_VARIABLES):
             self.addParameter(ParameterNumber(NUMBER
-                                              + unicode(i), 'dummy'))
+                                              + unicode(i), 'dummy', optional=True))
         self.addOutput(OutputNumber(RESULT,
                                     self.tr('Result', 'CalculatorModelerAlgorithm')))
 
