patch to add can_be_empty field to analysis_stats and analysis_stats_monitor

sql/patch_2011-01-20.sql

+# Add can_be_empty column to analysis_stats and analysis_stats_monitor tables:
+
+ALTER TABLE analysis_stats         ADD COLUMN can_be_empty          TINYINT UNSIGNED DEFAULT 0 NOT NULL;
+ALTER TABLE analysis_stats_monitor ADD COLUMN can_be_empty          TINYINT UNSIGNED DEFAULT 0 NOT NULL;
+