fix a few GDAL/OGR Processing optional parameters

Author: Giovanni Manghi

python/plugins/processing/algs/gdal/ogr2ogrdissolve.py

@@ -75,7 +75,7 @@ def defineCharacteristics(self):
         self.addParameter(ParameterBoolean(self.STATS,
                                            self.tr('Compute min/max/sum/mean for the following numeric attribute'), False))
         self.addParameter(ParameterTableField(self.STATSATT,
-                                              self.tr('Numeric attribute to compute dissolved features stats'), self.INPUT_LAYER))
+                                              self.tr('Numeric attribute to compute dissolved features stats'), self.INPUT_LAYER, optional=True))
         self.addParameter(ParameterString(self.OPTIONS,
                                           self.tr('Additional creation options (see ogr2ogr manual)'),
                                           '', optional=True))

python/plugins/processing/algs/gdal/ogr2ogrtopostgis.py

@@ -84,11 +84,11 @@ def defineCharacteristics(self):
         self.addParameter(ParameterSelection(self.GTYPE,
                                              self.tr('Output geometry type'), self.GEOMTYPE, 0))
         self.addParameter(ParameterCrs(self.A_SRS,
-                                       self.tr('Assign an output CRS'), ''))
+                                       self.tr('Assign an output CRS'), '', optional=True))
         self.addParameter(ParameterCrs(self.T_SRS,
-                                       self.tr('Reproject to this CRS on output '), ''))
+                                       self.tr('Reproject to this CRS on output '), '', optional=True))
         self.addParameter(ParameterCrs(self.S_SRS,
-                                       self.tr('Override source CRS'), ''))
+                                       self.tr('Override source CRS'), '', optional=True))
         self.addParameter(ParameterString(self.HOST,
                                           self.tr('Host'), 'localhost', optional=False))
         self.addParameter(ParameterString(self.PORT,

python/plugins/processing/algs/gdal/ogr2ogrtopostgislist.py

@@ -96,11 +96,11 @@ def defineCharacteristics(self):
         self.addParameter(ParameterSelection(self.GTYPE,
                                              self.tr('Output geometry type'), self.GEOMTYPE, 0))
         self.addParameter(ParameterCrs(self.A_SRS,
-                                       self.tr('Assign an output CRS'), ''))
+                                       self.tr('Assign an output CRS'), '', optional=True))
         self.addParameter(ParameterCrs(self.T_SRS,
-                                       self.tr('Reproject to this CRS on output '), ''))
+                                       self.tr('Reproject to this CRS on output '), '', optional=True))
         self.addParameter(ParameterCrs(self.S_SRS,
-                                       self.tr('Override source CRS'), ''))
+                                       self.tr('Override source CRS'), '', optional=True))
         self.addParameter(ParameterString(self.SCHEMA,
                                           self.tr('Schema name'), 'public', optional=True))
         self.addParameter(ParameterString(self.TABLE,

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

@@ -80,7 +80,7 @@ def defineCharacteristics(self):
         self.addParameter(ParameterSelection(self.EXPAND,
                                              self.tr('Expand'), ['none', 'gray', 'rgb', 'rgba']))
         self.addParameter(ParameterCrs(self.SRS,
-                                       self.tr('Output projection for output file [leave blank to use input projection]'), None))
+                                       self.tr('Output projection for output file [leave blank to use input projection]'), None, optional=True))
         self.addParameter(ParameterExtent(self.PROJWIN,
                                           self.tr('Subset based on georeferenced coordinates')))
         self.addParameter(ParameterBoolean(self.SDS,

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

@@ -64,7 +64,7 @@ def defineCharacteristics(self):
         self.group, self.i18n_group = self.trAlgorithm('[GDAL] Projections')
         self.addParameter(ParameterRaster(self.INPUT, self.tr('Input layer'), False))
         self.addParameter(ParameterCrs(self.SOURCE_SRS,
-                                       self.tr('Source SRS'), ''))
+                                       self.tr('Source SRS'), '', optional=True))
         self.addParameter(ParameterCrs(self.DEST_SRS,
                                        self.tr('Destination SRS'), ''))
         self.addParameter(ParameterString(self.NO_DATA,