Polish GridFilter by removing field default values for all fields.

modules/plugin_dbui/converter.py

@@ -417,14 +417,18 @@ def to_gridFilter(table, **kwargs):
         # get the standard configuration for the field
         cfg = to_field(field)
         
-        # remove default value for fields which are not comboBox
-        if cfg['xtype'] != 'xcombobox':
-            cfg['value'] = ''
-            cfg['allowBlank'] = True
-        
+        # remove default value 
+        # make no sense in this context
+        if 'value' in cfg:
+            del cfg['value']
+
         # replace all textarea by textfield
         if cfg['xtype'] == 'textarea':
             cfg['xtype'] = 'textfield'
+
+        # empty text for combobox
+        if cfg['xtype'] == 'xcombobox':
+            cfg['emptyText']= 'select...'
         
         # prepare the name for the where close [table.field]
         cfg['name'] = name    
@@ -433,7 +437,7 @@ def to_gridFilter(table, **kwargs):
         cfg['filterComment'] = comment  
         cfg['filterOperator'] = operator
         cfg['filterType'] = field.type
-        
+                    
         # copy the comment to be used as a tool tip
         # when the plugin pFormToolTip is used
         cfg['tipText'] = comment