'Theme key "blocks" not found.' in watchdog(), node_top/node_bottom not rendered (?)

Theme key "blocks" not found. is logged to watchdog() when using a Fusion subtheme.

The error message was introduced as part of #412730: Theme system should optionally report when a theme key is not found - it's in D7 and is intended to warn when theme('foo') is called and there's no theme_foo() or foo.tpl.php implemented.

Appears that theme_blocks() is D6 only. This comment by peach may be of interest too.

Looks like node_top and node_bottom need to be handled differently in fusion_core_preprocess_node(). I expect that blocks assigned to those regions will not be rendered currently. Would be good if someone has a chance to confirm that.