[processing] change nodata default to none instead of 0 in gdal's translate alg

Author: nirvn

python/plugins/processing/algs/gdal/translate.py

@@ -69,7 +69,7 @@ def initAlgorithm(self, config=None):
         self.addParameter(QgsProcessingParameterNumber(self.NODATA,
                                                        self.tr('Assign a specified nodata value to output bands'),
                                                        type=QgsProcessingParameterNumber.Double,
-                                                       defaultValue=0.0,
+                                                       defaultValue=None,
                                                        optional=True))
         self.addParameter(QgsProcessingParameterBoolean(self.COPY_SUBDATASETS,
                                                         self.tr('Copy all subdatasets of this file to individual output files'),