[processing] make nodata parameter optional in gdal's warp algorithm

nirvn · nyalldawson · commit dc2a1c52e8a7 · 2018-07-16T15:44:06.000+10:00
diff --git a/python/plugins/processing/algs/gdal/warp.py b/python/plugins/processing/algs/gdal/warp.py
@@ -90,7 +90,8 @@ def initAlgorithm(self, config=None):
         self.addParameter(QgsProcessingParameterNumber(self.NODATA,
                                                        self.tr('Nodata value for output bands'),
                                                        type=QgsProcessingParameterNumber.Double,
-                                                       defaultValue=0.0))
+                                                       defaultValue=None,
+                                                       optional=True))
         self.addParameter(QgsProcessingParameterNumber(self.TARGET_RESOLUTION,
                                                        self.tr('Output file resolution in target georeferenced units'),
                                                        type=QgsProcessingParameterNumber.Double,
