set nodata parameter as optional in GDAL clip by extent

Giovanni Manghi · Giovanni Manghi · commit fb5921250b59 · 2016-04-25T21:22:27.000+01:00
diff --git a/python/plugins/processing/algs/gdal/ClipByExtent.py b/python/plugins/processing/algs/gdal/ClipByExtent.py
@@ -73,7 +73,7 @@ def defineCharacteristics(self):
             self.INPUT, self.tr('Input layer'), False))
         self.addParameter(ParameterString(self.NO_DATA,
                                           self.tr("Nodata value, leave blank to take the nodata value from input"),
-                                          ''))
+                                          '', optional=True))
         self.addParameter(ParameterExtent(self.PROJWIN, self.tr('Clipping extent')))
 
         params = []
