PHP Notices for $topic0attop in course using grid format

[Manoj Solanki]

The following notices appear when full debug mode is on when viewing a section in a course that is using grid format.

Notice: Undefined property: theme_adaptable_format_grid_renderer::$topic0attop in /opt/bitnami/apps/moodle/htdocs/theme/adaptable/renderers.php on line 107

Notice: Undefined property: theme_adaptable_format_grid_renderer::$topic0attop in /opt/bitnami/apps/moodle/htdocs/theme/adaptable/renderers.php on line 87

[Manoj Solanki]

Fix #910.

→ <<cset 9d66d2c2ecb5>>

[Manoj Solanki]

Merge in pull request changes for grid format to fix issues for section 0 options. Fix #910.

→ <<cset ec09ee19ffc6>>