[ADD] base_import: info message when everything looks ok after a validation

bzr revid: xmo@openerp.com-20121001140622-v63opfo97mmxf3sr

addons/base_import/static/src/css/import.css

@@ -31,6 +31,9 @@
 .oe_import .oe_import_error_report ul .oe_import_report_warning {
     background-color: #FEFFD9;
 }
+.oe_import .oe_import_error_report ul .oe_import_report_info {
+    background-color: #d3ffd3;
+}
 
 .oe_import .oe_import_noheaders {
     color: #888;

addons/base_import/static/src/js/import.js

@@ -311,8 +311,10 @@ openerp.base_import = function (instance) {
         },
         render_import_result: function (message) {
             if (_.isEmpty(message)) {
-                this.$el.removeClass('oe_import_error');
-                return;
+                message.push({
+                    type: 'info',
+                    message: _t("Everything seems valid.")
+                });
             }
             // row indexes come back 0-indexed, spreadsheets
             // display 1-indexed.