Ensure View Data on a table with zero columns doesn't throw an error. Fixes #1677

web/pgadmin/tools/sqleditor/__init__.py

@@ -531,6 +531,9 @@ def fetch_pg_types(trans_id):
 
         # List of oid for which we need type name from pg_type
         oid = ''
+        res = {}
+        if 'columns_info' in session_obj \
+                and session_obj['columns_info'] is not None:
             for col in session_obj['columns_info']:
                 type_obj = session_obj['columns_info'][col]
                 oid += str(type_obj['type_code']) + ','

web/pgadmin/tools/sqleditor/static/css/sqleditor.css

@@ -407,3 +407,7 @@ input.editor-checkbox {
 .grid-canvas .new_row.error, .grid-canvas .updated_row.error {
   background: #e46b6b;
 }
+
+#datagrid div.slick-header.ui-state-default {
+  background: #2c76b4;
+}