Allow gdal_rasterize to accept -init with value of 0; changed default value to not introduce a breaking change

suricactus · nyalldawson · commit 36c821da34de · 2019-01-18T09:50:08.000+11:00
diff --git a/python/plugins/processing/algs/gdal/rasterize.py b/python/plugins/processing/algs/gdal/rasterize.py
@@ -127,7 +127,6 @@ def initAlgorithm(self, config=None):
         init_param = QgsProcessingParameterNumber(self.INIT,
                                                   self.tr('Pre-initialize the output image with value'),
                                                   type=QgsProcessingParameterNumber.Double,
-                                                  defaultValue=0.0,
                                                   optional=True)
         init_param.setFlags(init_param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
         self.addParameter(init_param)
@@ -181,8 +180,8 @@ def getConsoleCommands(self, parameters, context, feedback, executing=True):
         arguments.append(self.parameterAsDouble(parameters, self.WIDTH, context))
         arguments.append(self.parameterAsDouble(parameters, self.HEIGHT, context))
 
-        initValue = self.parameterAsDouble(parameters, self.INIT, context)
-        if initValue:
+        if self.INIT in parameters and parameters[self.INIT] is not None:
+            initValue = self.parameterAsDouble(parameters, self.INIT, context)
             arguments.append('-init')
             arguments.append(initValue)
 
