[forms] Fix handling of NULLs

superset/models/core.py

@@ -163,7 +163,7 @@ class Slice(Model, AuditMixinNullable, ImportMixin):
                      'viz_type', 'params', 'cache_timeout')
 
     def __repr__(self):
-        return self.slice_name
+        return self.slice_name or str(self.id)
 
     @property
     def cls_model(self):
@@ -291,10 +291,14 @@ class Slice(Model, AuditMixinNullable, ImportMixin):
     def edit_url(self):
         return '/chart/edit/{}'.format(self.id)
 
+    @property
+    def chart(self):
+        return self.slice_name or '<empty>'
+
     @property
     def slice_link(self):
         url = self.slice_url
-        name = escape(self.slice_name)
+        name = escape(self.chart)
         return Markup(f'<a href="{url}">{name}</a>')
 
     def get_viz(self, force=False):
@@ -407,7 +411,7 @@ class Dashboard(Model, AuditMixinNullable, ImportMixin):
                      'description', 'css', 'slug')
 
     def __repr__(self):
-        return self.dashboard_title
+        return self.dashboard_title or str(self.id)
 
     @property
     def table_names(self):
@@ -436,6 +440,10 @@ class Dashboard(Model, AuditMixinNullable, ImportMixin):
     def datasources(self):
         return {slc.datasource for slc in self.slices}
 
+    @property
+    def charts(self):
+        return [slc.chart for slc in self.slices]
+
     @property
     def sqla_metadata(self):
         # pylint: disable=no-member
@@ -443,7 +451,7 @@ class Dashboard(Model, AuditMixinNullable, ImportMixin):
         return metadata.reflect()
 
     def dashboard_link(self):
-        title = escape(self.dashboard_title)
+        title = escape(self.dashboard_title or '<empty>')
         return Markup(f'<a href="{self.url}">{title}</a>')
 
     @property

superset/views/core.py

@@ -572,7 +572,7 @@ class DashboardModelView(SupersetModelView, DeleteMixin):  # noqa
     edit_columns = [
         'dashboard_title', 'slug', 'owners', 'position_json', 'css',
         'json_metadata']
-    show_columns = edit_columns + ['table_names', 'slices']
+    show_columns = edit_columns + ['table_names', 'charts']
     search_columns = ('dashboard_title', 'slug', 'owners')
     add_columns = edit_columns
     base_order = ('changed_on', 'desc')
@@ -599,7 +599,7 @@ class DashboardModelView(SupersetModelView, DeleteMixin):  # noqa
         'dashboard_link': _('Dashboard'),
         'dashboard_title': _('Title'),
         'slug': _('Slug'),
-        'slices': _('Charts'),
+        'charts': _('Charts'),
         'owners': _('Owners'),
         'creator': _('Creator'),
         'modified': _('Modified'),