Set correct defaults for icalFeeds in existant calendars. Fixes bug #11005

docs/changelog/7.x.x.txt

@@ -48,6 +48,7 @@
  - fixed #10954: DataForm fails silently
  - fixed #10950: Thingy
  - fixed #10976: Form::Date not internationalized /DateTime::setToEpoch
+ - fixed #11005: calendar feed workflow
 
 7.7.19
  - fixed #10838: Forwarded forum post email to new CS adds reply to original thread

docs/upgrades/upgrade_7.7.19-7.8.0.pl

@@ -36,6 +36,7 @@ fixTemplateSettingsFromShunt($session);
 addSubscribableAspect( $session );
 addMatrixColumnDefaults($session);
 addFeaturedPageWiki( $session );
+fixEmptyCalendarIcalFeeds( $session );
 
 finish($session); # this line required
 
@@ -49,6 +50,19 @@ finish($session); # this line required
 #    print "DONE!\n" unless $quiet;
 #}
 
+#----------------------------------------------------------------------------
+# Add the column for featured wiki pages
+sub fixEmptyCalendarIcalFeeds {
+    my $session = shift;
+    print "\tSetting icalFeeds in the Calendar to the proper default... " unless $quiet;
+
+    $session->db->write( 
+        "UPDATE Calendar set icalFeeds='[]' where icalFeeds IS NULL",
+    );
+
+    print "DONE!\n" unless $quiet;
+}
+
 #----------------------------------------------------------------------------
 # Add the column for featured wiki pages
 sub addFeaturedPageWiki {